Contagions Diseases of Insects. 307 



less abundant than was usually the case with individuals so 

 seriously affected. The epithelial cells of the intestine con- 

 tained granular masses, seemingly of the micrococci, and the 

 fluid bathing them was thick with the same objects. Occasion- 

 ally patches or clusters of the micrococci occurred in contact 

 with the food. The stained and mounted slides of the blood 

 show chiefly mulberry granules, spherical or somewhat angular 

 in outline, 1.5 /* to 3 /* in diameter. A small number of 

 spherical micrococci also occurred, many of them minute, 

 ranging from .6 ^ to .8 /*. These appear in all the usual forms 

 of aggregation, including doubles, short chaplets, and patches 

 of considerable size. Bacilli also occasionally occur, with 

 parallel sides and rounded ends, from 1.25 /* to 1.5 p in trans- 

 verse diameter, and from 3 /* to 4 ^ in length. A single Bacillus 

 intrapallens was noticed in process of development, measuring 

 1.75 ^ by 2 p. 



On the 30th June still another larva died, the grayish 

 fluids of which contained immense numbers of the spherical 

 micrococci, single and double, with vast quantities of the bacilli 

 above described, motionless at first, but soon, near the edges 

 of the cover or in the vicinity of a bubble, commencing active 

 flagellate movements. The body of the next larva to die, (July 

 1,) was flaccid, and contained little fluid. Immense numbers 

 of spherical micrococci, 1 ^ in diameter, occurred in the blood, 

 mostly in doubles, together with many ovals about 1.5 /* long. 

 Neither Bacterium nor Bacillus were detected in this specimen. 



On the 2d, a caterpillar, evidently diseased, shrunken, and 

 shortened, but with colors yet bright, was found lying upon 

 the floor of the cage, able to right itself when turned over, but 

 making no effort to escape. Blood from a foot of this larva 

 contained a great number of unsegmented cells, similar to blood 

 corspucles, but of variable size and shape, some with and some 

 without nuclei. A few hours later, when the blood was 

 examined again, besides these cells were found a considerable 

 number of segmented bodies and mulberry cells, the latter 

 evidently due to dissolution of the former. The next day 

 this segmentation of the cells in question had gone still farther 

 in this larva, and very many mulberry cells were distinguish- 

 able, together with others but partly segmented. 



