SACBROOD. 



23 



Fig. 25.— The tissues of a worker larva after being dead of sacbrood about one week. A, cross section, 

 semidiagrammatic, of the abdomen in the region of the ovaries, showing a recently cast cuticula, or 

 molt sWn (Cj), a newly formed cuticula (Ci), the hypodermis (Hyp), the stomach (St), the ovaries (Ov), 

 the heart (Ht), the ventral nerve cord (VNC), the dorsal diaphragm (DDph), tracheae (Tra), ceno- 

 cytes (Oe), and fat cells (FC). Between the cuticula C2 and the cuticula Ci is a considerable intercu- 

 tioular space (IS). B represents the body wall in this patholofjical condition, showing the cuticula C2 

 and the cuticula Ci, both bearing spines (SCj and SCi), and theintercutioular space (IS) in which is 

 found evidence of a coagulum formed from the fluid filling the space by the action of the fixing fluids. 

 The remainder of the body wall, the hypodermis (Hyp), and the basement membrane (BM) are also 

 shown. C, fat cell with irregular outline, irregular nucleus (Nu), and deep staining bodies (DSB). 

 Dj oenocyte with uniformly staining cytoplasm, and with a nucleus (Nu) havmg a uniform outline. 

 E, a portion of the stomach wall showing the epithelium (SEpth) during metamorphosis, it being at 

 this time quite columnar in type, and the musculature (M). (Original.) 



