Shinkishi Hatai 435 
5.980 and 6.009 are two factors for the transformation of the observed 
weight obtained from shot, into the estimated brain-weight. In other 
words, if we apply the characteristic equations which enable us to compare 
the cranial capacity in terms of the weight of shot from the observed body- 
weight, directly to the adult rats with known body- and brain-weight. 
(We have a large number of records which give the observed brain-weight 
accompanied by the corresponding body-weight) then the observed brain- 
weight was found to be 1/5.98 of the weight of shot in the case of male 
and 1/6.009 of the weight of shot in the case of female. This simple 
numerical relation between the observed brain-weight and shot-weight was 
found to be quite consistent and indeed the characteristic equations with 
these two new factors have given very satisfactory results in the test thus 
far. 
(e) Coefficients of correlation in man and rat.—The coefficients of 
correlation between the cranial capacity and other cranial measurements 
in man have been determined by several investigators. The following 
table shows these relations in man as well as in rat: 
TABLE IX. 
CORRELATION BETWEEN CRANIAL CAPACITY AND LENGTH OF SKULL. 
Male. Female. Difference. Investigator. 
IAGINOM Ns she etsne os .893 + .016 .663 + .053 .200 + .055 Pearson and Lee. 
Hmelish) 25... 259% == Obi .691 + .040 .094 + .065 Macdonell. 
German ..... 515 == .050 687 + .0387 —.172 + .062 Pearson and Lee. 
Naquada ..... EX0IL SE {0)sy! 599 + .0389 —.098 + .067 Fawcett. 
Albinowrat 2... .6i == .039 ED dile=taa OO 184 + .073 Hatai. 
CORRELATION BETWEEN CRANIAL CAPACITY AND BREADTH OF SKULL. 
PANIMIO ME versisvernre 3: ¢ bot ==.053 -502 + .070 .059 + .083 Pearson and Lee. 
Hnelishh =... .631 + .048 .646 + .044 —.015 + .065 Macdonell. 
German ..... 672 == .037 707 + .0384 —.0385 + .050 Pearson and Lee. 
Naquada .... .484+ .058 532 + .044 —.098 + .072 Fawcett. 
Albino rat ... .8388 == .028 .632 —& .057 .206 + .063 Hatai. 
CORRELATION BETWEEN CRANIAL CAPACITY AND HEIGHT OF SKULL. 
PAMITVOE v3 che orcas 544 + .054 521 + .068 .023 + .087 Pearson and Lee. 
German) 9s... . .243 + .064 451 + .054 —.208 + .084 Pearson and Lee. 
Mibinoerat ... 000) .039 .666 + .053 .094 + .066 Hatai. 
CORRELATION BETWEEN CRANIAL CAPACITY AND (HEIGHT X BREADTH X LENGTH). 
PAGIT Ola cra) a) 3's -795 + .039 Mehl) = (VEIT .015 + .054 Pearson and Lee. 
German ..... -701 + .034 814 + .023 —.113 + .041 Pearson and Lee. 
Naquada .... .674+.044 (98 = .025 —.119 = .051 Pearson and Lee. 
Albino rat (height x 
breadth x length) 4 .836 + .028 854 + .026 018 + .038 Hatai. 
