tr.br. 



Rg31. 



Section of Lung. 



tr.hr., tertiary Va'oiichus ; a-v.. air-vesicles ; a., branch of i)uliii(iiiary artery. 



S.t. 



Fig.32. 



Section of Kidney under Low Magnification. 

 C.S., cortical substance ; gl., gloniernlus ; v., blood-vessels; s.t., straight tubules. 



