292 Illinois State Laboratory of Natural History. 



commonly arranged in small groups; occasionally, also, an 

 unsegmented rod, possibly Bacillus. Nothing representing the 

 minute spherical micrococci characteristic of the native disease 

 of the cabbage worm occurred in this specimen. The next day, 

 September 12, one larva pupated and four perished. The first of 

 these examined was already blackened and deliquescent. It con- 

 tained nothing but large and small micrococci strictly spherical 

 in form, the large one 1 /* in diameter, the other about .6 or .7 p. 

 Both occurred usually in doubles, but not unfrequently in 

 singles or short chains. Both stained well in methyl violet, 

 and good slides were prepared. The smaller form of the above 

 micrococci was found only in the blood, and the larger only in 

 the intestine, as indicated by the stained slides from these two 

 sources. 



The second larva studied was soft and grayish green, but 

 the skin was tougher than usual, and showed little tendency to 

 the characteristic deliquescence of the cabbage worm disease. 

 The fluids were yellowish white, and contained great numbers 

 of large and small spherical micrococci, the larger 1 ^ in 

 diameter, the smaller .6 or .7 ^. 



The third specimen, smaller than the preceding one, was a 

 little darker in color, the fluids yellowish green and containing 

 identical micrococci. Both forms were spherical and of the 

 same dimensions as those just described. A single Bacillus was 

 also noted, 2.5 n in length, and an occasional double oval occurs 

 upon the slides (probably Bacterium) each oval element about 

 .8 A* long. 



The fourth specimen was flaccid, but bright green, its 

 fluids thick and milky white. It contained a moderate number 

 of large spherical micrococci, identical in appearance with those 

 described above, varying in character from .8 ^ to 1 ^. Besides 

 these, the blood was literally loaded with large spheres, evi- 

 dently mulberry granules, occurring singly and in masses, the 

 diameter varying from 2 to 4 p. A close correspondence in 

 the condition of this larva to that of the silkworm affected with 

 jaundice will at once be noted. 



Four other larvae, two of which died September 13 and two 

 on the day following, were briefly examined, but not carefully 

 studied. Their fluids presented no considerable differences from 



