3(2 THE DOCTRINE OF DESCENT. 



" The passages are from an occasional address — Oratio de 

 ellure hal)itabili — contained in the Amcenitates acadeinica. " Initio 

 rerum ex omni specie viventium unicum sexus par fuisse creatum, 

 suadet ratio." 



" lb. Non multum a veritate me aberratum confido, si dixerim, 

 omnen continentem terram fuisse in infantia mundi aquis sub- 

 mersam et vasto oceano obtectam, prseter unicam in immense 

 hoc pelago insulam, in qua commode habitaverint animalia omnia 

 et vegetabilia leete germinaverint." 



" Tot numeramus species, quot ah initio creavit infinitum ens." 



" Geoffroy St. Hilaire wrote to Cuvier : " Venez jouer parmi 

 nous le role de Linn6, d'un autre Ifigislateur de I'histoire naturelle." 



'* Ossements fossiles. 



" L. Agassiz, An Essay on Classification, 1859. P. 253 : — 



"As representatives of Species, individual animals bear the 

 closest relations to one another ; they exhibit definite relations also 

 to the surrounding element, and their existence is limited within a 

 definite period. 



" As representatives of Genera these same individuals have a 

 definite and specific ultimate structure, identical with that of the 

 representatives of other species," etc. See also P. 261 : — 



" Branches or types are characterized by the plan of their struc- 

 ture ; 



" Classes, by the manner in wliich that plan is executed, as far 

 as ways and means are concerned ; 



" Orders, by the degrees of complication of that structure ; 



" Families, by their form, as far as determined by structure ; 



" Genera, by the details of the execution in special parts ; and, 



" Species, by the relations of individuals to one another, and to 

 the world in which they live, as well as by the proportions of their 

 parts, their ornamentation," etc. 



"" Haeckel, Generelle Morphologic der Organismen (Berlin, i856). 

 II. 323, &c. 



'■" L'espSce est — " la reunion des individus descendant I'un de 

 I'autre et des parents communs. et de ceux qui leur ressemblent 

 autant qu'ils se ressemblent entr'eux." Cuvier, Le Regne Ani- 

 mal. 



