"The variety of human types, or races, must be accounted for along the lines of climate, customs, food, etc., and especially along the lines of the seclusion of the various peoples in various quarters from each other, by which peculiarities became fixed. This is illustrated by the fact that Europeans living for a long time amongst the people of India or China gain a measure of resemblance to their neighbors, while their children, born in those lands, bear a still stronger resemblance in skin and features - affected no doubt by the mother's surroundings during the period of gestation."
(The New Creation; 1899; 1915 ed.; pp. 42)
An interesting quotation drawn from Watchtower publications.