Bui. 1, new series, Div. of Entomology, U. S. Dept. of Agriculture, 

 rig. X A 700. 



Plate XI. 



Vigbyj 



J:'-.g.ex4-. 



Bacillus Alvei (Cheshire). 



[Drawn from nature by Frank K. C'lu'shiiv for .lour. K. Mier. Soo., and heiv reiliu-eil one- 

 sixth from the oriirinal jihtte.] 

 Fig. 1.— Residue of larva three days dead of bacillus alvei; />. baoiUi. SiH-»res and ilejrener 



ated tracha^ cover the field. 

 Fig. 2.— Healthy juices of bee larva. , . - 



Fig. 3 — .luices of larva <livin}r> with disea.se in acute staire; a a. lei^othnx forms. 

 Fig 4. -Brood cells from a diseased colony; (f a, cells coutainiui; liealthy puinv: /» Ik 



sunken and inmctured cells in which i)niKe have died. ^ , •„ 



Fig. 5.— Cultivation in sterilized atrara.irar slu>win,ir the colony torm of bacillus. 

 Fig. t).— Same cultivation twenty-ifour hours later. 

 Fig. 7. — S]>ore changing; into bai-illi. 

 Fio 8. — Bacillus passinj; into spore ctMidition. 



