tinsurpassed data of John M\rshalt/). Here the value of 0.219 was 

 found for ?'. 



I tried to explain that strongly deviating behaviour of individuals of 

 Man, differing in size, in comparison with species of Mammals of 

 different sizes, by the uncomparatively great supremacy of the brain 

 over other organs and parts of the skull in Man. The inferior augmen- 

 tation of the brain with the size of the body might be a consequence, 

 in my opinion then, of an exceptionally strong pi-ogressing folding of 

 the grey cortex, going hand in hand with that augmentation of the 

 brain as a whole. At the present state of our knowledge, now that 

 we know that in all Vertebrates in general, independently of 

 its shape and structure, the augmentation of the brain is equal for 

 all species that are of a similar organisation, the interpretation 

 then given, that can only be applied to Man, must be entirely 

 abandoned. I should certainly immediately have rejected ii, if I had 

 known that, a few months previously in 1898, Lapicque, when 

 applying the relation I had found for Mammals, to dogs of different 

 sizes, according to evidences borrowed from a series of Richet, had 

 obtained the same result, as 1 now found for Man. That result had, 

 moreover, only been communicated by Lapicque in a report of the 

 proceedings of the meeting of the Société de Biologie on the IS^'» 

 of January 1898, in hardly a single page of printing^) together with 

 the announcement of my memoir on Mammals. 



His conclusion ran: "Tout ce que je veux établir aujourd'hui, 

 c'est que la puissance de P (the weight of the body), suivant laquelle 

 varie i'encéphale d'espèce a espèce étant 0.55, dans Tespèce chien 

 cette puissance est 0.25, c'est a dire extremement différent". Simul- 

 taneously with my paper on Man of 1898, in the "Archiv fur An- 

 thropologic", Lapicque published with Dhere another article^), in 

 which the authors communicate as briefly the result for the Dog, 

 mentioned above, and, on account of an examination of the chemical 

 composition of the bi*ain, try to find an explanation of the exponent 

 found for this species in the relative amount of white and grey 



1) On the relations between the weight of the brain and its parts, and the 

 stature and mass of the body. Journal of Anatomy and Physiology. Vol 26. London 

 1892. p. 445. There the weights of the bodies of living men, according to 

 John Beddoe (Memoirs. Anlhrop. Soc. London. Vol. III. 1870, p. 533). 



~) "Sur la relation du poids de Tencéphale au poids du corps" in "Gomptes 

 lendus hebdomadaires des seances de la Sociélé de Biologie". Paris 1898. N*^. 2 

 (21 Janvier 1898), p. 63. 



•5) "Sur le rapport enlre la grandeur du corps et le développement de I'encé- 

 phale". in "Archives de Physiologic normale et pathologique", N^. 4. Oclobre 1898. 

 Paris, p. 768—773. 



