1. Numberless traces of post-pliocene lakes, now disappeared, are found over Central, West, and North Asia. Shells of the same species as those now found in the Caspian Sea are scattered over the surface of the soil as far East as half-way to Lake Aral, and are found in recent deposits as far north as Kazan. Traces of Caspian Gulfs, formerly taken for old beds of the Amu, intersect the Turcoman territory. Deduction must surely be made for temporary, periodical oscillations. But with all that, desiccation is evident, and it progresses at a formerly unexpected speed. Even in the relatively wet parts of South-West Siberia, the succession of reliable surveys, recently published by Yadrintseff, shows that villages have grown up on what was, eighty years ago, the bottom of one of the lakes of the Tchany group; while the other lakes of the same group, which covered hundreds of square miles some fifty years ago, are now mere ponds. In short, the desiccation of North-West Asia goes on at a rate which must be measured by centuries, instead of by the geological units of time of which we formerly used to speak. 2. Whole civilizations had thus disappeared, as is proved now by the remarkable discoveries in Mongolia on the Orkhon and in the Lukchun depression (by Dmitri Clements). 3. If I follow the opinions of (to name modern specialists only) Nasse, Kovalevsky, and Vinogradov, and not those of Mr. Seebohm (Mr. Denman Ross can only be named for the sake of completeness), it is not only because of the deep knowledge and concordance of views of these three writers, but also on account of their perfect knowledge of the village community altogether--a knowledge the want of which is much felt in the otherwise remarkable work of Mr. Seebohm. The same remark applies, in a still higher degree, to the most elegant writings of Fustel de Coulanges, whose opinions and passionate interpretations of old texts are confined to himself.