Show lc lc l J J lr 1 Why Are There ere Different Races o of Men Itlen A that t the e various existing races A of mankind are arc descended from a common stock how are to be explained such striking striking striking ing differences as those that distinguish for example example example ex ex- ample the Chinaman fr from m the Saxon Anglo-Saxon and the Saxon Anglo-Saxon from the negro Prof Arthur Keith recently discussed this question in an address address ad ad- dress before the anthropological section of the British Association l I He believes that the key to this problem is to tobe tobe tobe be found through studying the disturbances and disorders that occasionally affect the develop develop- development ment I and growth of the human body especially those due to a functional derangement of one or more of the glands of internal secretion secretion tho pituitary th thyroid roid pineal adrenal and other glands In some manner not yet understood the functions carried on in these glands regulate not only the dimensions of the body but also the shape and size of each individual part The racial features of the Mongolian type are imitated b by growing Europeans who are affected by deficiency disorders of the th thyroid roid gland The features of the negro can best be accounted for forby forby forby by the nature of the regulating growth-regulating mechanism mechanism mechanism ism centred in the thyroid and suprarenal glands European features are connected with a dominance dominance dominance domi domi- nance in the functions of the pituitary Scientists hope that a thorough study of the still very obscure subject of the so-called so ductless glands will provide the means of regulating to some extent the future evolution of the human race |