292 APPENDIX 



Blood vessels: 



Small artery of the cat and rat. 



Aorta of the dog. 



Mesenteric vein of the cat. 



Jugular vein of a bird, a hawk. 

 Lymph organs: 



Tonsil of the dog. 



Tonsil of human. 



Mesenteric lymph gland of the squirrel and cat. 



Cervical lymph gland of the cat and dog. 



Hemolymph gland of the rat. 



Spleen of the bullfrog. 



Spleen of Necturus, Zenker fixed and Mallory stained. 



Spleen of the water snake. 



Spleen and duodenum of a hawk. 



Spleen of a cat and dog. 



Thymus of a cat. 

 Integument: 



Integument of a bass (fish with ctenoid scales), celloidin em- 

 bedded. 



Integument of Necturus. 



Integument of a frog. 



Wing of new-born sparrow, longitudinal section, showing skin 

 and developing feathers together with developing bone. 



Footpad of a squirrel, embedded in celloidin. 



Human scalp, embedded in celloidin. 



Ear of a rabbit, cross-sections. 



Mammary gland of the cat, longitudinal section through the 

 nipple. 

 Resj)iratory system: 



Gill of a dogfish, longitudinal section through the septa. 



Gill of Necturus, longitudinal section. 



Lung of Necturus, cross-section. 



Glottis and openings into the lung of the frog, longitudinal 

 section of pharyngeal region. 



Lung of a toad and frog, cross-section. 



Trachea and lung of the water snake (Natrix), cross-sections. 



Trachea and esophagus of a bird (a grouse), cross-section. 



Lung of a hawk, cross-section. 



Larynx of the cat, cross-section. 



