. The Journal of comparative neurology and psychology. 0 * .204* .031* 55 .409 .047 60 .522 .059 65 .660 .077 ? 70 .827 .088 75 .962 .106 80 .129 90 .159 100 .194 110 .235 120 .270 130 .305 140 .346 150 .381 160 .428 170 .463 180 .498 190 .539 200 .580 210 .621 220 .656 225 .691 * Since the formulas do not allow of extrapolation toward the lower end of the curve, theaverages of the observ
. The Journal of comparative neurology and psychology. 0 * .204* .031* 55 .409 .047 60 .522 .059 65 .660 .077 ? 70 .827 .088 75 .962 .106 80 .129 90 .159 100 .194 110 .235 120 .270 130 .305 140 .346 150 .381 160 .428 170 .463 180 .498 190 .539 200 .580 210 .621 220 .656 225 .691 * Since the formulas do not allow of extrapolation toward the lower end of the curve, theaverages of the observed values are here employed. 137 females as shown on Chart III. The difference betAveen the twosexes is slight, and in this instance therefore the data for bothsexes will be treated together. The theoretic ciir\e which fits the means most closely has beenobtained in the following manner:— For the body lengths given in Table 3, the body weights werecalculated by formula (4) transposed as follows:— BRAIN AND SPINAL CORD OF H. ....-•irih-tiA^^^^^ ^ i I I L BODY LENGTH 1 I 1 mm. 50 60 70 80 90 100 110 120 130 140 150 160 170 180 190 200 To show In the albino rat, the brain weight and spinal cord weight according to body length. (1) Upper entries, brain. Individual records, 196 males «, 137 females is based on formula (8). (2) Lower entries, spinal cord, 189 males •, 137 females X. The theoretic curve is based on formula (3). 210 220 The theoretic The Jocrnal of Compabativb NEDEOLoat and Pstcholoot.—Vol. XIX. No. 2 Donaldson, Brain and Spinal Cord of Rat. i6i y + 134 143 10 - 15 (4) where X represents the body weight and y the body length. On the basis of the body weights thus determined the weight ofthe brain can be culeulated by the revised forniuhi (8) /.. u TN .569 n-jiR =^ / ^. log X 1-^^ (x - ) -^^^ - V y = — / X 1-^^ \ 2 o V ^ (x - ) r^ - . .1 (8) Ll + (logx) « 1 + (logx) -J as given by Hatai, 09, in this number
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