130 



SCIENTIFIC THOUGHT. 



Keeping this unity of form, this absorbing vortex of 

 life, the totality of organisation, always before him, 

 Cuvier, in surveying the whole region of animated 

 nature, 1 fixes finally for the purposes of classification and 

 division on that system of organs which expresses most 

 truly the peculiarity of each of the great branches into 

 which he divides the animal world namely, the nervous 

 system. 2 But rather than follow him at present into the 



1 " La partie anatomique du prob- 

 leme general de la vie est re'solue 

 depuis longtemps pour les animaux, 

 au moins pour ceux d'entre eux qui 

 nous inte"ressent le plus. Les voies 

 que les substances y parcourent, 

 sont connues ; . . . il apergoit 

 aussi comment ces routes, si com- 

 plique'es dans 1'homme, se simpli- 

 fient par degre"s dans les animaux 

 inferieurs, et finissent par se require 

 11 une spongiosite" uniforme. Les re- 

 cherches de M. Cuvier dans les 

 lemons d 'anatomic compare'e ont 

 achieve" d 'assignor h, chaque animal 

 sa place dans la grande echelle des 

 complications de structure " (' Rap- 

 port,' p. 202, &c.) 



2 It is not my object here to give 

 an account of the views of Cuvier, 

 still less of his contributions to 

 natural history, which in spite of 

 the special theories and laws which 

 he and his followers established (see 

 especially Flourens, 'Histoire des 

 Travaux de Georges Cuvier,' 3 me 

 &L, 1858) remained in his hands 

 to the last pre-eminently a science 

 of observation. It has been pointed 

 out that Cuvier only gradually (pro- 

 bably about 1812) arrived at the final 

 principle of division viz., the ner- 

 vous system and that he adopted 

 it from others (notably Virey and 

 De Blainville), that before 1812 he 

 had successively used the organs of 

 generation (1795), of nutrition, and 

 of circulation as principles of clas- 

 sification. In his Report of 1808, 



in mentioning his own labours, he 

 says : " M. Cuvier, en e"tudiant la 

 physiologic des animaux verte"bres, 

 a trouve" dans la quantite" respective 

 de leur respiration, la raison de leur 

 quantit^ de mouvemens, et par con- 

 se"quent de 1'espece de ces mouve- 

 mens. . . . En effet, M. Cuvier, 

 ayant examin les modifications qu' 

 e"prouvent dans les animaux sans 

 verte"bres les organes de la circula- 

 tion, de la respiration, et des sensa- 

 tions, et ayant calcule" les resultats 

 ne'cessaires de ces modifications, en 

 a de"duit une division nouvelle ou 

 ces animaux sont range's suivant 

 leurs veYitables rapports " (' Rap- 

 port,' p. 311, &c.) Compare also 

 Carus, ' Geschichte der Zoologie,' 

 Munchen, 1872, p. 602 ; Flourens, 

 " Eloge de Cuvier," in his ' Eloges 

 historiques,' 3 me se"rie, Paris, 1862, 

 p. 122, &c. ; Hahn in the ' Grande 

 Encyclopedic,' article " Cuvier." See 

 also the Introduction to the ' Regne 

 animal,' which proposes to arrange 

 living beings according to their " or- 

 ganisation," by investigating their 

 " structure," their " internal as well 

 as external conformation." Cuvier 

 here states that no one before had 

 tried to arrange the classes and 

 orders according to the "ensemble 

 de la structure " (p. vi). He is thus 

 led to the law of the " subordination 

 des caracteres, . . . ayant soin 

 d'e"tablir toujours la correspond- 

 ance des formes exterieures et in- 

 te"rieures qui, les unes comme les 



