6oJ 



llie relation between (jnanlity of brain and size of (lie body likewise 

 for the lower elasses of V^erlebrates. This is connected here with 

 greater difticnlties, for wiiereas in Birds the relative weight of 

 the brain is still of the same order of amount as in Mammals, 

 it descends in the inferior classes, both absolutely and relativelj', 

 as low as to the order of magnitude of about Vio ^^ that of the two 

 highest classes. The quantities of brain we have to deal with are 

 thus absolutely little, and we can only make use of those rare 

 cases of the usually very scarce evidences about these classes, in 

 which the weights of the bodies show great differences. A few 

 accurate evidences are found in Welcker's "Gewichtswerthe der 

 Körperorgane bei dem Menschen und den Tliieren", published after 

 the author's death by A. Bkaisdt ^). Further L. Lapjcque and H. Laugier") 

 gave in 1908 some trustworthy determinations of weight, and lately 

 G. Watkrlot, who had made himself conversant with the technical 

 method in the Laboratory of IjAPICQUE, published a great number of 

 weights of brains and bodies of Vertebrates, among which also 

 Reptiles and Amphibia, determined in Dahomey '). 



As early as 1855 and 1856 E. Crisp gave trustworthy evidences 

 concerning a Reptile and a Fish ''). 



Among Waterlot's Reptiles were a Monitor and a Gecko, belonging 

 both to the same sub-order of the Lacertilia as likewise the Emerald- 

 Lizard, of which Laugier and Tjapicque communicated the weight. 



All were full-grown animals, the Monitor (Varanus niloticus) was 

 a subject of mean size; four individuals of the little Gecko (Hemi- 

 dactylus Brooki) were weighed and consequently average weights 

 can be calculated. The weight of the body of the Varanus is 1600 

 times that of the Gecko and almost 450 times that of the Emerald 

 Lizard. Under these circumstances trustworthy results may be expected. 

 A third good comparison of Reptiles affords a Viper (Vipera berus), 

 of which Crisp weighed 7 individuals, with a Cobra (Naja melano- 

 leuca) of Dahomey, weighing almost 28 times as much. A few other 

 Reptiles have been inserted into the following table. The values of 

 k calculated with r = 0.56 are likewise indicated in it, as well as 

 the average diameter of the eye-ball of some species °). 



1) Archiv fur Anthropologie. Vol. 28 (Braunschweig 1902), p.p. 55—61. 



2) Gomptes renlus. Soc. de Biologie. Paris 1908, Vol. 64. p. 1108. 



3) Bulletins du Muséum d'Histoire naturelle. Paris 1912, p. 491. 



*) E. Crisp, Proceed. Zool. Soc. London. Part. 23. (1855), p. 191. Ibid. Part 24. 

 (1856), p. 106. 



5) NO. 7, 2 and 4 have been borrowed from Wateblot (I.e.), 3 and 8 from 

 Lapicque (I.e.) 5 from Crisp I.e. (1855), 6, 7 and 9 from Welcker — Brakdt d-c). — 

 An Alligator mississippiensis from Hrdlicka, cited by Lapicque (Bull, et Mém. Soc. 



