VI CONTENTS. 



PAOl 



XIII. Special organs 87 



Lasso cells 88 



Organs of touch 88 



Organs of smelling 91 



Eye 92 



Appendages to the eye 95 



Ear 96 



XIV. Sexual characters 101 



XV. Reproductive system 103 



Sperm cell 103 



Ovum 104 



Organs of generation 109 



Testicle 109 



Ovary 109 



XVI. Generation 120 



Mammary gland 135 



MEDICAL ZOOLOGY. 



Mammalia 137 



Moschus 137 



Viverra 139 



Castor 139 



Hyrax 141 



Catodon 142 



Reptilia 143 



Caudisona .- 143 



Crotalus 143 



Ancistrodon 144 



Vipera 144 



Cerastes 144 



Naja...., 144 



Hydrophis 145 



Pisces 145 



Gadus 145 



Acipenser 145 



Insecta 147 



Cantharis 147 



Acanthi a 151 



Notonecta 152 



Nepa 153 



Aphis , 153 



Coccus 153 



Apis 154 



Cynips .* 155 



