Missionary Travels and Researches in South Africa, David Livingstone [novels for teenagers .TXT] 📗

>Our cruisers have been the principal agents in compelling them to abandon the slave-trade; and our government, in furnishing them with a supply of cotton-seed, showed a generous intention to aid them in commencing a more honorable course. It can scarcely be believed, however, that after Lord Clarendon had been at the trouble of procuring fresh cotton-seed through our minister at Washington, and had sent it out to the care of H. M. Commissioner at Loanda, probably from having fallen into the hands of a few incorrigible slave-traders, it never reached its destination. It was most likely cast into the sea of Ambriz, and my friends at Golungo Alto were left without the means of commencing a new enterprise.

Mr. Canto mentioned that there is now much more cotton in the country than can be consumed; and if he had possession of a few hundred pounds, he would buy up all the oil and cotton at a fair price, and thereby bring about a revolution in the agriculture of the country.

These commodities are not produced in greater quantity, because the people have no market for those which now spring up almost spontaneously around them. The above was put down in my journal when I had no idea that enlarged supplies of cotton from new sources were so much needed at home.

It is common to cut down cotton-trees as a nuisance, and cultivate beans, potatoes, and manioc sufficient only for their own consumption.

I have the impression that cotton, which is deciduous in America, is perennial here; for the plants I saw in winter were not dead, though going by the name Algodao Americana, or American cotton.

The rents paid for gardens belonging to the old convents are merely nominal, varying from one shilling to three pounds per annum. The higher rents being realized from those in the immediate vicinity of Loanda, none but Portuguese or half-castes can pay them.

When about to start, the horse which the governor had kindly presented for Sekeletu was seized with inflammation, which delayed us some time longer, and we ultimately lost it. We had been careful to watch it when coming through the district of Matamba, where we had discovered the tsetse, that no insect might light upon it. The change of diet here may have had some influence in producing the disease; for I was informed by Dr. Welweitsch, an able German naturalist, whom we found pursuing his arduous labors here, and whose life we hope may be spared to give his researches to the world, that, of fifty-eight kinds of grasses found at Loanda, only three or four species exist here, and these of the most diminutive kinds.

The twenty-four different species of grass of Golungo Alto are nearly all gigantic. Indeed, gigantic grasses, climbers, shrubs and trees, with but few plants, constitute the vegetation of this region.

NOVEMBER 20TH. An eclipse of the sun, which I had anxiously hoped to observe with a view of determining the longitude, happened this morning, and, as often took place in this cloudy climate, the sun was covered four minutes before it began. When it shone forth the eclipse was in progress, and a few minutes before it should (according to my calculations) have ended the sun was again completely obscured. The greatest patience and perseverance are required, if one wishes to ascertain his position when it is the rainy season.

Before leaving, I had an opportunity of observing a curious insect, which inhabits trees of the fig family (`Ficus'), upward of twenty species of which are found here. Seven or eight of them cluster round a spot on one of the smaller branches, and there keep up a constant distillation of a clear fluid, which, dropping to the ground, forms a little puddle below.

If a vessel is placed under them in the evening, it contains three or four pints of fluid in the morning. The natives say that, if a drop falls into the eyes, it causes inflammation of these organs.

To the question whence is this fluid derived, the people reply that the insects suck it out of the tree, and our own naturalists give the same answer. I have never seen an orifice, and it is scarcely possible that the tree can yield so much.

A similar but much smaller homopterous insect, of the family Cercopidae', is known in England as the frog-hopper (Aphrophora spumaria'), when full grown and furnished with wings, but while still in the pupa state it is called "Cuckoo-spit", from the mass of froth in which it envelops itself. The circulation of sap in plants in our climate, especially of the graminaceae, is not quick enough to yield much moisture.

The African species is five or six times the size of the English.

In the case of branches of the fig-tree, the point the insects congregate on is soon marked by a number of incipient roots, such as are thrown out when a cutting is inserted in the ground for the purpose of starting another tree.

I believe that both the English and African insects belong to the same family, and differ only in size, and that the chief part of the moisture is derived from the atmosphere. I leave it for naturalists to explain how these little creatures distill both by night and day as much water as they please, and are more independent than her majesty's steam-ships, with their apparatus for condensing steam; for, without coal, their abundant supplies of sea-water are of no avail. I tried the following experiment: Finding a colony of these insects busily distilling on a branch of the `Ricinus communis', or castor-oil plant, I denuded about 20 inches of the bark on the tree side of the insects, and scraped away the inner bark, so as to destroy all the ascending vessels.

I also cut a hole in the side of the branch, reaching to the middle, and then cut out the pith and internal vessels. The distillation was then going on at the rate of one drop each 67 seconds, or about 2 ounces 5-1/2 drams in 24 hours. Next morning the distillation, so far from being affected by the attempt to stop the supplies, supposing they had come up through the branch from the tree, was increased to a drop every 5 seconds, or 12 drops per minute, making 1 pint (16 ounces) in every 24 hours. I then cut the branch so much that, during the day, it broke; but they still went on at the rate of a drop every 5 seconds, while another colony on a branch of the same tree gave a drop every 17 seconds only, or at the rate of about 10 ounces 4-4/5 drams in 24 hours.

I finally cut off the branch; but this was too much for their patience, for they immediately decamped, as insects will do from either a dead branch or a dead animal, which Indian hunters soon know, when they sit down on a recently-killed bear. The presence of greater moisture in the air increased the power of these distillers: the period of greatest activity was in the morning, when the air and every thing else was charged with dew.

Having but one day left for experiment, I found again that another colony on a branch denuded in the same way yielded a drop every 2 seconds, or 4 pints 10 ounces in 24 hours, while a colony on a branch untouched yielded a drop every 11 seconds, or 16 ounces 2-19/20 drams in 24 hours.

I regretted somewhat the want of time to institute another experiment, namely, to cut a branch and place it in water, so as to keep it in life, and then observe if there was any diminution of the quantity of water in the vessel. This alone was wanting to make it certain that they draw water from the atmosphere. I imagine that they have some power of which we are not aware, besides that nervous influence which causes constant motion to our own involuntary muscles, the power of life-long action without fatigue. The reader will remember, in connection with this insect, the case of the ants already mentioned.

DECEMBER 14TH. Both myself and men having recovered from severe attacks of fever, we left the hospitable residence of Mr. Canto with a deep sense of his kindness to us all, and proceeded on our way to Ambaca. (Lat. 9d 16' 35" S., long. 15d 23' E.) Frequent rains had fallen in October and November, which were nearly always accompanied with thunder. Occasionally the quantity of moisture in the atmosphere is greatly increased without any visible cause: this imparts a sensation of considerable cold, though the thermometer exhibits no fall of the mercury. The greater humidity in the air, affording a better conducting medium for the radiation of heat from the body, is as dangerous as a sudden fall of the thermometer: it causes considerable disease among the natives, and this season is denominated "Carneirado", as if by the disease they were slaughtered like sheep.

The season of these changes, which is the most favorable for Europeans, is the most unhealthy for the native population; and this is by no means a climate in which either natives or Europeans can indulge in irregularities with impunity.

Owing to the weakness of the men who had been sick, we were able to march but short distances. Three hours and a half brought us to the banks of the Caloi, a small stream which flows into the Senza.

This is one of the parts of the country reputed to yield petroleum, but the geological formation, being mica schist, dipping toward the eastward, did not promise much for our finding it. Our hospitable friend, Mr. Mellot, accompanied us to another little river, called the Quango, where I saw two fine boys, the sons of the sub-commandant, Mr. Feltao, who, though only from six to eight years old, were subject to fever.

We then passed on in the bright sunlight, the whole country looking so fresh and green after the rains, and every thing so cheering, one could not but wonder to find it so feverish.

We found, on reaching Ambaca, that the gallant old soldier, Laurence Jose Marquis, had, since our passing Icollo i Bengo, been promoted, on account of his stern integrity, to the government of this important district. The office of commandant is much coveted by the officers of the line who come to Angola, not so much for the salary as for the perquisites, which, when managed skillfully, in the course of a few years make one rich. An idea may be formed of the conduct of some of these officials from the following extract from the Boletin of Loanda of the 28th of October, 1854: "The acting governor-general of the province of Angola and its dependencies determines as follows:

"Having instituted an investigation (Syndecancia) against the commandant of the fort of ----, a captain of the army of Portugal in commission in this province, ----, on account of numerous complaints, which have come before this government, of violences and extortions practiced by the said commandant, and those complaints appearing by the result of the investigation to be well founded, it will be convenient to exonerate the captain referred to from the command of the fort of ----, to which he had been nominated by the portfolio of this general government, No. 41, of 27th December of the past year; and if not otherwise determined, the same official shall be judged by a council of war for the criminal acts which are to him attributed."

Even this public mention of his crimes attaches no stigma to the man's character. The council of war, by which