6 PREFACE. 



rate works of Milne-Edwards 1 and Bronn, 2 in which a 

 very full Bibliography will be met with. Dr. Rolleston's 

 valuable " Types of Animal Life," and the " Elementary 

 Instruction in Practical Biology," by myself and Dr. 

 Martin, will prove useful adjuncts to the appliances of the 

 practical worker. 



1 " Lemons sur la Physiologie et l'Anatomie comparee de 1' Homme et des 

 Animaux." Tomes i.-xii. (incomplete). 



2 " Die Klassen und Ordnungen des Thierreichs." Bde. i.-vi. (incomplete). 



London, June, 1877. 



