SECRETING GLANDS. 



407 



members of this division and the next, as the former by 

 their length and tortuosity do between the first division 

 and the third (D, fig. 101). 



Fig. ioi.* 



* Fig. ioi. Plans of extension of secreting membrane by inversion or 

 recession in form of cavities. A, simple glands, viz., g, straight tube ; 

 h, sac ; i, coiled tube. B, multilocular crypts ; &, of tubular form ; 

 I, saccular. C, racemose, or saccular compound gland ; m, entire gland, 

 showing branched duct and lobular structure ; n, a lobule, detached with 

 o, branch of duct proceeding from it. D, compound tubular gland 

 (after Sharply). 



