PLATE I 



Lungs of Southern Whales (cf. vol. vii, pi. XV). 

 Fig. I. Southern Right whale, stained with Haematoxylin-Eosin. 



(X125.) 

 Fig. 2. Fin whale, stained as fig. i. ( x 125.) 

 Fig. 3. Sperm whale, stained as fig. i. ( x 125.) 

 Fig. 4. Humpback whale, stained with Weigert-Van Gieson to show 



elastic tissue, (x 125.) 

 Fig. 5. Fin whale, stained as fig. 4. ( x 125.) 

 Fig. 6. Southern Right whale, stained with Haematoxylin-Eosin. 



( X 300-) 



a. Small vein. 



b. Arteriole. 



c. Capillary endothelium. 



d. Endothelial nuclei. 



e. Alveolar air space. 



/. Red blood corpuscle. 

 g. Elastic fibres. 

 Fig. 7. Southern Right whale, stained with HaematoxyUn-Eosin. 



( x 300.) 



a. Arteriole about to merge into capillary network. 



b. Arteriole larger than above. 



c. Branch from arteriole seen in longitudinal section and con- 

 necting directly with the capillary network which bounds the 

 alveolar air space. 



