Fic. 33.—Surface view of salivary gland. d., common duct; dc. col- 
lecting duct; g., gland proper. 
Fic. 34.—Surface view of salivary gland. n., cell nucleus; cb., cell 
boundary; c., cells. 
Fic. 35.—Cross-section of salivary gland (showing histolysis). n., cell 
nucleus. 
Fic. 36.—Surface view of tracheal system. ad., anterior ramifications; 
mt., main lateral trunks; ct., cross branches; |b. lateral branches; pd., pos- 
terior ramifications. 
