The law of _maximum_ and _minimum_, which has just been treated of, presents a remarkable exception which is seen in cold countries as Sweden, Finland, St. Petersburgh, &c. In these countries, exceptions occur most frequently in the months of December and January, in short in winter. Different causes have been supposed to account for this exception: there is but one however, which will explain it well--that is the manner in which the inhabitants of these countries are clothed during the cold season. By means of dress and warmth they then create an artificial climate by which they are enabled to resist the rigor of that in which they dwell. The whole body is enveloped in numerous thick and warm garments, which fit accurately, envelope it exactly and preserve for the body its natural temperature: placing these individuals in a position analogous to that of vegetables which are hastened in their growth by manure. Farther they preserve in their dwellings a degree of temperature which would be insupportable in a temperate climate. In fact if the inhabitants of the polar regions should keep civil registers of births, their examination would doubtless demonstrate that in these rude climates, the fine season is not that of amours. It is well known that puberty in these countries is more precocious, as is the case under the tropics. Thus the Samoid women menstruate at the age of 11 years and are often mothers at 12. (Klingstadt, _Memoire sur les Samoides_, pp. 41. & 43.) This is not to be wondered at when we consider that they live in subterranean caves, where there is a stifling heat produced by throwing water on redhot stones. Dwellings then in cold countries may be considered as hot houses which act on man as they do on vegetables.