. Le Journal de la neurologie et de la psychologie comparatives. LE cas de Mus norvegicus Var. Albus. Longueur du corps poids du corps mm. Rapports. gms. Les deux sexes combinés (voir tableau 2.) 5 51.9 10..38 15 77.6 5.17 25 94.8 3.78 35 109.1 3.11 45 120.5 2.67 55 130.6 2.37 65 137.7 2.11 75 144.9 1.93 85 152.0 1.78 95 157.7 1.66 105 163.4 1.55 115 167.7 1.45 125 173.5 1.38 135 177.7 1.31 145 180.6 1.24 155 184.9 1.19 165 189.2 1.14 175 192.0 1.09 185 194.9 1.05 195 197.8 1.01 205 200.6 .97 215 203.5 .94 225 206.3 .91 235 209.2 .89 245 210.6 .85 255 213.5 .83 265 216.4 .81 275 217.8 .79 285 220.6 .77 295 222.1 .75 305

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. The Journal of comparative neurology and psychology. THE Case of Mus Norvegicus Var. Albus. Body length Body weight mm. Ratios. gms. Both sexes combined(See Table 2.) 5 51.9 10..38 15 77.6 5.17 25 94.8 3.78 35 109.1 3.11 45 120.5 2.67 55 130.6 2.37 65 137.7 2.11 75 144.9 1.93 85 152.0 1.78 95 157.7 1.66 105 163.4 1.55 115 167.7 1.45 125 173.5 1.38 135 177.7 1.31 145 180.6 1.24 155 184.9 1.19 165 189.2 1.14 175 192.0 1.09 185 194.9 1.05 195 197.8 1.01 205 200.6 .97 215 203.5 .94 225 206.3 .91 235 209.2 .89 245 210.6 .85 255 213.5 .83 265 216.4 .81 275 217.8 .79 285 220.6 .77 295 222.1 .75 305 224.9 .73 315 226.4 .71 325 227.8 .70 The theoretical curve which most closely represents the changein body length with increasing body weight, is given by theformula (4) y = 143 log (x + 15) — 134 where y represents the body length and x the body weight. This is a formula of the same type as those used for determiningthe weight of the brain and of the spinal cord in relation to the BBAIN AND SPINAL CORD OF RAT.HENRT H. DONA mm. 240220 BODY LENGTH. BODY WEIGHT J I I I I I I I I I I I I I J L G^s. 20 40 60 80 100 120 140 160 180 200 To show in the albino rat, the mean values for the body length according to body weight, sexes separated; 220 240 260 280 300 320 males, females. The theoretic curve is not drawn, as it would confuse the other lines. The JonnNAL op CoiipAniTivE Nbceolooy and Psychology.—Vol. XIX, No. 2. Donaldson, Brain and Spinal Cord of Rat. 159 weight of the body, and the type has been already discussed in aprevious paper (Donaldson, 08, p. 350). In this connection, however, there are some points to be correctedand further discussed. The consideration of these points is takenup in a paper by Dr. Hatai which apj)ears at this time. TABLE 2. Mean l)()(ly leiij^tli :u-ci)rdiiig to body weight in Mus iiorvogicus var. albus.The body length as given in the last coUnnu has been calculated by thefomnila (4), y — 143 log (x + 15)—134. Body Length Observed. Body Bod

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