There is a fair concensus of opinion to the effect that what we may call climate exerts an important influence. In climate the two factors recognised as of chief importance are temperature and moisture. High temperature combined with moisture certainly tends to depress the vital activity of Europeans and to render them indolent, indisposed to exertion of any kind. On the other hand, high temperature combined with dryness of the atmosphere seems to have the effect of rendering men but little disposed to continuous activity, and yet capable of great efforts; it tends to produce a violent spasmodic activity. A cold climate seems to dispose towards sustained activity and, when combined with much moisture, to a certain slowness. These effects, which we ourselves experience and which we see produced upon other individuals on passing from one climate to another, we seem to see impressed upon many of the races which have long been subjected to these climates; for example, the slow and lazy Malays have long occupied the hottest moistest region of the earth. The Arabs and the fiery Sikhs may be held to illustrate the effect of dry heat. The Englishman and the Dutchman seem to show the effects of a moist cool climate, a certain sluggishness embodied with great energy and perseverance. In these and other cases, in which the innate temperament of a people corresponds to the effects directly induced by their climate, it seems natural to suppose that the innate temperament has been produced by the transmission and accumulation from generation to generation of the direct effects of the climate. The assumption is so natural that it has been made by almost every writer who has dealt with the question. And these instances of conformity of the temperament of peoples to the direct effects of climate are sometimes offered as being among the most striking evidences of the reality of hereditary transmission of acquired qualities; and the argument is reinforced by instances of what seem to be similar results produced by climate on physical types. Thus, it is said that in North America a race characterised by a new specific combination of mental and physical qualities is being rapidly formed; and it seems to be well established that long slender hands are among these features; for in Paris a specially long slender glove is made every year in large quantities for the American market. Again, we see apparently a change of physical type in the white inhabitants of Australia. They seem to be becoming taller and more slender ‘cornstalks’; and this is commonly regarded as the direct effect of climate.