6 PREFACE. 



rate works of Milne-Edwards* and Bronn,*" in wliicli a 

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

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

 Instruction in Practical Biology," by myself and Dr. 

 Martin, will prove useful adjuncts to the appliances of the 

 practical worker. 



* " Legons sur la Physiologie et I'Anatomie comparee de I'Homme et des 

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



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



London, June^ 1877. 



