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Of all the checks to population among savage nations mentioned by Malthus starvation, disease, war, infanticide, immorality, and infertility of the women the last is that which he seems to think least important, and of doubtful efficacy; and yet it is the only one that seems to me capable of accounting for the state of the population among the Sarawak Dyaks.
In the four succeeding chapters, the most apparent and gravest difficulties on the theory will be given: namely, first, the difficulties of transitions, or in understanding how a simple being or a simple organ can be changed and perfected into a highly developed being or elaborately constructed organ; secondly the subject of Instinct, or the mental powers of animals, thirdly, Hybridism, or the infertility of species and the fertility of varieties when intercrossed; and fourthly, the imperfection of the Geological Record.
And those tents which they bring with them, when they haue sufficiently hunted and fished, they remoue to other places: and when they haue sufficiently stored them of such victuals, as the Countrey yeeldeth or bringeth forth, they returne to their winter stations or habitations. This coniecture do I make, for the infertility which I coniecture to be in that Countrey.
In the five succeeding chapters, the most apparent and gravest difficulties in accepting the theory will be given: namely, first, the difficulties of transitions, or how a simple being or a simple organ can be changed and perfected into a highly developed being or into an elaborately constructed organ; secondly the subject of instinct, or the mental powers of animals; thirdly, hybridism, or the infertility of species and the fertility of varieties when intercrossed; and fourthly, the imperfection of the geological record.
He did not make love in the sense of seeking to persuade his goddess to descend to him, but he made no further disguise of himself, and he was not again reproved. This all led to a long space of infertility, and it was stretched still further by the departure of the Baroness to Paris.
From these facts; from the great difficulty of ascertaining the infertility of varieties in a state of nature, for a supposed variety if infertile in any degree would generally be ranked as species; from man selecting only external characters in the production of the most distinct domestic varieties, and from not wishing or being able to produce recondite and functional differences in the reproductive system; from these several considerations and facts, I do not think that the very general fertility of varieties can be proved to be of universal occurrence, or to form a fundamental distinction between varieties and species.
On this account we find the reverse of this in the Bible, telling us that worship of the stars will result in lack of rain and infertility. In the life of nature we see how one thing serves another, and certain objects are not brought about except through certain others, and development is gradual.
Already complaints are heard of the greater dryness and infertility of certain localities, which I do not doubt comes from suffering the ground to become bare. At several points I was told that the streams were permanently lower than in former years of course because evaporation goes on more rapidly near their head waters now that the ground is bare.
His statistics showed that among the Dayaks the men outnumber the women somewhat, and that children are few. In one small kampong there were no children. The same fact has been noted in other parts of Borneo. The hard labour of the women has been advanced as a reason. Doctor A.W. Nieuwenhuis believes that inborn syphilis is the cause of the infertility of the Bahu on the Upper Mahakam.
"Well, Sir," said the Chief, "we have made both extensive intensive investigations concerning the chemistry of the soil solution by very delicate and sensitive methods of analysis we have developed, and we have also conducted culture experiments for twenty-day periods with wheat seedlings in the water extract of soils from all parts of the United States, and the results we have obtained have changed the thought of the world as to the cause of the infertility of soils."
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