The distinguished scientist, A. R. Wallace, claims, from twelve years' experience within ten degrees of the equator, that the common notion that white men can not live and work in the tropics is an error; on the contrary, work is a condition of healthy existence there as in temperate climates. Yellow fever, he says, is a product of the slave trade; where that has not existed yellow fever is absent. Other diseases, such as plague, are due to unsanitary conditions, and even malaria and jungle fever are not altogether due to the climate. Tropic swamps in a state of nature are, he claims, healthy localities. In even cultivated tropic regions malaria is no worse than it was in England 200 years ago. In the Dutch East Indies, white men have lived for many generations without deterioration, and in Queensland, an intensely torrid region, white men work and thrive and "the