GLANDS AND SKCEETIONS 



101 



sacs about a common duct, and such arrangements are 

 called tubular, racemose or tubular-racemose according as 

 the separate elements are tubelike or branched or a com- 

 bination of the two. Such glands are called compound 



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Fig. 29 — Forms of glands; A and i?, simple layers of mucous membrane cells; 

 1, a simple tubular gland ; 2, a forked tubular gland ; 3, a simple saccular gland 

 with duet, rf ; 5, a saccular gland still more divided ; 6, a, compound racemose 

 gland with common duct, d. 



