OF THE CONAEIO-HTPOPHTSIAL TEACT. 



143 



tary canal {ih., e), a fact which was deemed by anatomists of the 

 "Positive School" conclusive as against the " Transcenden- 

 talists." 



Having satisfied myself that there is a way out of the difii- 

 culty by rightly determining the homologies of the mouth and 

 gullet in Mollusks and Articulates with recognizable structures 

 in Vertebrates, I have submitted the facts and conclusions which 

 have led me to harmonize the oppositions, and to show that the 

 ingenious idea of MM. Laurencet and Meyranx, adopted and 

 advocated by G-eoffroy, was not, in point of fact, open to the ob- 

 jection which relegated it to the limbo of exploded notions, where 

 it seems to have rested now for half a century. 



I reproduce the diagrammatic illustrations (figs. 7 and 8) by 

 Fig. 7. Fig. 8. 



V A 



Cuttle. Mammal. 



Schematic views as referred to in the text. 



which Cavier exemplified his objections, in order to show how the 

 homology I have propounded of the " conario-hypophysial tract " 

 aflfects the argument and conclusion of the great anatomist. The 

 sole liberty I have taken with that diagram (fig. 8) is to add to 

 the brain of the Mammal the tract in question (;, s) ; the signifi- 

 cance of which to his argument Cuvier as little suspected as have 

 his successors who have devoted time and thought to the higher 

 generalizations of Biology. 



