Mr. Davis, of England, having a collection of about eighteen hundred cranial specimens obtained from different quarters of the globe, ascertained the relative volume of brain in different races, by filling the skulls with dry sand. He found that the European averaged 92 cubic inches, the Oceanic 89, the Asiatic 88, the African 86, the Australian 81. Dr. Morton, of Philadelphia, had a collection of over one thousand skulls, and his conclusions were that the Caucasian brain is the largest, the Mongolian next in size, the Malay and American Indian smaller, and the Ethiopian smallest of all. The average weight of brain, in 278 Europeans, was 49.50 oz., in 24 White American soldiers, 52.06 oz., indicating a greater _average_ for the American brain. OUNCES The brain of Cuvier, the celebrated naturalist, weighed 64.33 Ruloff, the murderer and linguist, 59.00 Dr. Spurzheim--phrenologist, 55.06 Celebrated philologist, 47.90 Celebrated mineralogist, 43.24 Upholsterer, 40.91 The weight of the human brain varies from 40 to 70 oz.; that of idiots from 12 to 36 40 oz. The average of 273 male European brains was 49½ oz., while that of 191 females was 44 oz. If we compare the weight of the female brain with that of the body, the ratio is found to be as 1:36.46, while that of the male is as 1:36.50; showing that, relatively, the female brain is the larger. It appears that neither the absolute nor relative size of the cerebrum, but the amount of gray matter which it contains, is the criterion of mental power. Although a large cerebrum is generally indicative of more gray matter than a small one, yet it is ascertained that the grey substance depends upon the number, and depth of the convolutions of the brain, and the deeper its fissures, the more abundant is this tissue. It is this substance which is the source of thought, while the white portion only transmits impressions.