SACBKOOD. 



23 



a.-. 



Ci-- 



Tra -_ 



Oe (-V 



DDph 



DDph 



Via. 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 skin (d), a newly formed cliticu la (Q), thehypodcrmis(nyp), the stomach (St), the ovaries (Ov), 

 the heart (Ht;, the ventral nerve cord (VNC), the dorsal diaphragm (DDph), tracheaa (Tra), oeno- 

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

 tfcular space (I.S). R represents the body wall in this pathological condition, showing the cuticula Ca 

 and the cuticula Tj, both bearing spines (SCj and .S('i), and the intorcuticular space (IS) in which is 

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

 The remaindfT of the body wall, the hypodermi.s (Hyp), and the liasoment membrane (BM) are also 

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

 IJ, oenocyto with uniformly staining cytojilasm, and with a nucleus (Nu) having a uniform outline. 

 E, a porlJon of the stomach wall showing the epitlinllum (SKpth; during metamorphosis, it being at 

 thfai time <ni\Ui columnar in type, and the musculature (M). (Original.) 



