. 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 15 25 35 45 55 65 75 85 95 105 115 125 135 145 155 165 175 185 195 205 .97 215 .94 225 .91 235 .89 245 .85 255 .83 265 .81 275 .79 285 .77 295 .75 305
. 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 15 25 35 45 55 65 75 85 95 105 115 125 135 145 155 165 175 185 195 205 .97 215 .94 225 .91 235 .89 245 .85 255 .83 265 .81 275 .79 285 .77 295 .75 305 .73 315 .71 325 .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 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. 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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