236 



and independently of the distinguished French pliysiologist, in the 

 same year, by me for Man'). In 1907 this result was ron firmed by 

 Lapicque') for Man; at, present, from the new observations of weight 

 on 150 Berlin dogs by Bkktholü Klatt') I can corroborate the 

 result obtained by Lapicquk from Riohk/i's 188 Paris dogs'*). 



Similar low interindividual exponents of relation as for Man and 

 the Domestic Dog are now also valid within other species. For 

 obvious reasons: very imjiortant differences of the body weights in 

 one case, numerousness of the observations of weight in the other, 

 the species Domestic Dog and Man are most suitable for a coinparison 

 of the individuals. But we so often meet with similar values, lying 

 in the neighbourhood of Vi8 = 0.27 or lower, within other species, 

 tiiat here the existence of another, but equally real law may be 

 admitted. 



The same relation of brain weight and body weight as between 

 large and small adult individuals of Man and the Dog is certainly 

 also valid for the Horse. The data are not very numerous here, 

 but the differences in body weight are comparatively large. A 

 heavy Belgian horse, according to Cornevin ^), weighed 1040 kg. 

 when alive, and its cranial capacity was 805 c.c. ; a light Camargue 

 horse had only 320 kg. living weight, and its cranial capacity 

 was determined at 585 c.c. From this an exponent of relation of 

 0.2708 can be calculated. Prof. J. C Evvart at Edinburgh was so 

 kind as to send me, for measurement, the skull of a very typical 

 Shetland pony, a mare of 367, inches or 92'/, cm. height. Length 

 of skull, from incisivi to occiput, 40'/, cm. The capacity is 475 c.c. 

 I owe to Dr. C. Kekbkrt the communication of the body weight 

 of such a pony living in the Amsterdam zoological gardens, a male 



1) EuG. Dubois, Ueber die Abhangigkeit des Hirngewichtes von der Körper- 

 grösse beira Menschen. Archiv fiir Anthropologic. Band 25, p. 423— 441. Braunsch- 

 weig. 1898. 



*) L. Lapigque, Le poids encéphalique en fonction du poids corporel entre 

 individus d'une nniême espèce. Bulletins et mémoires de la Société d'Anthropologie 

 de Paris. Séance du 6 Juin 1907. ö^e série, Tome 8, p. 316. Paris 1908. 



S) Berthold Klatt, Studiën zam Domestikationsproblem. Untersuclmngen am 

 Hirn. Bibliotheca Genetica (E. Baur). Band II. 180 pag. My calculations are to be 

 published in Bijdragen tot de Dierkunde. XXII. Hat sich das Gehirn beim Haus- 

 hunde, im Vergleich mil VVildhundarten, vergrössert, oder verkleinert ? Leiden 19i22. 



*) Charles Bichet, Poids du cerveau, de la rate et du foie, chez les Chiens de 

 différenles tailles. Physiologie. Travaux du Laboratoire de M. Charles Richet. 

 Tome Deuxième, p. 381 — 397. 



^) Ch. Cornevin, Examen compare de la capacité cranienne dans les diverses 

 races des espèces domestiques. Journal de médecine vétérinaire et de zootechnie, 

 publié a rÉcole de Lyon, S'^e Série, Tome 14, p. 24. 1889. 



