. The anatomical record. Anatomy; Anatomy. 60 GEORGE G. SCOTT percentage content of water in the brain tissue goes. This is in agreement with the result obtained by Kellicott. But what is the condition as regards the percentage of water in the brain at different ages? Since there are no sex differences we can group together the males and females. Nothing is known of the exact age of the dog-fish but in general they increase in length and weight as they grow older. Kellicott, following the methods of Moenkhaus and Fulton with teleosts, has roughly estimated the ages as shown in table o. TABLE 5
. The anatomical record. Anatomy; Anatomy. 60 GEORGE G. SCOTT percentage content of water in the brain tissue goes. This is in agreement with the result obtained by Kellicott. But what is the condition as regards the percentage of water in the brain at different ages? Since there are no sex differences we can group together the males and females. Nothing is known of the exact age of the dog-fish but in general they increase in length and weight as they grow older. Kellicott, following the methods of Moenkhaus and Fulton with teleosts, has roughly estimated the ages as shown in table o. TABLE 5. Now since we are ascertaining the relation of the percentage of water in the brain to the age and since age is measured by length and weight, it is necessary to distribute the specimens concern- ing which we have records, according to the above schedule. Applying Kellicott's criterion we have table 6. TABLE 6 (A) LENGTH + (B) WEIGHT HALE + FEMALE 1 year ^ 2 years. 3 years. 4 years. .') years. 6 + 3 = 22 + 15 = 20 + 19 = 3 + 4 = 0 + .5 = 9 37 39 7 5 Total, 97 7 + 4 = 11 22 + 18 = 40 18 + 14 = 32 4+3=7 0+7=7 Total, 97 We thus see that we have about the same distribution by length as by weight. It will be noted that the medium sized. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bardeen, Charles Russell, 1871-1935, ed; Boyden, Edward A. (Edward Allen), 1886-1976; Bremer, John Lewis, 1874- ed; Hardesty, Irving, b. 1866, ed; American Association of Anatomists; American Society of Zoologists; Wistar Institute of Anatomy and Biology. [New York, etc. ] A. R. Liss [etc. ]
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