38 MEMOIR OF CUVIER. 



to a system *. He therefore thought, that, by com- 

 bining Anatomy and Zoology, and mutually calling 

 in the one to the assistance of the other, he would 

 produce a system founded upon proper principles : 

 the commencement and progress of this may he 

 traced from 1795, when a memoir was published upon 

 a new arrangement of animals, having white blood, 

 which was extended in 1798, in his " Tableau Ele- 

 mentaire des Animaux," and improved still farther, 

 two years afterwards, in the tables annexed to the 

 first volume of the " Lemons d'Anatomie Comparee." 

 Cuvier appears to have considered the " Regne 

 Animal" the most laborious of his works. " It was 

 not sufficient," he writes, "to have imagined new dis- 

 tributions into classes and orders, and then to place 

 the genera ; but it was necessary to examine every 

 species, to know if, in reality, they belonged to the 

 genera in which they had been placed f." He was 

 assisted by many of his colleagues ; their collec- 

 tions and researches were as open to him as those 

 collected by himself, and this assistance is most 

 gratefully acknowledged. One part is less exclu- 

 sively his own than any other that devoted to 

 Entomology ; it is due to M. Latreille. " My friend 

 and colleague, M. Latreille, who has more deeply 

 studied these animals than any other man in Europe, 

 has given, in a single volume, the results of his ex- 

 tensive researches, with a table of the numerous ge- 



Preface to the First Edition, p. 6. 

 t Preface to the First Edition, p. 8. 



