218 IVAN E. WALLIN 
5. Staphylococcus albus. Cocci unstained and smaller than 
control. 
c. After 5 per cent formaldehyde. 1. Human tubercle bacilli. 
Bacilli could not be demonstrated by staining. Remains, in- 
tensely stained, large granules. 
2. Bovine tubercle bacilli. Bacilli could not be demonstrated 
by staining. Remains, granular. 
3. Unknown bacilli, culture from intestinal contents of kitten. 
Some large and small bacilli present that stain more intensely 
than control, also some swollen and unstained forms. 
4, Bacillus megatherium. Bacilli unstained and partially dis- 
solved. Spores unstained and coalesced. 
5. Staphylococcus albus. Cocci swollen, unstained, and 
coalesced. 
E, Action of potassium bichromate on bacteria 
Various strains of bacteria were subjected to the action of potas- 
sium bichromate in various concentrations for a period of four 
hours. The potassium bichromate was dissolved in distilled 
water. 
a. After 0.5 per cent solution of potassium bichromate. 1. 
Human tubercle bacilli. Bacilli intact could not be demonstrated 
by staining. Remains, intensely stained granules. 
2. Bovine tubercle bacilli. A few bacilli still retain form. 
Remainder of remains intensely stained granules. 
3. Staphylococcus pyogenes aureus. Normal cocci could not 
be demonstrated by staining. Remains, intensely stained minute 
"eaeer: 
4. Bacillus megatherium and spores. Bacilli could not be 
demonstrated by staining. Spores swollen and stained. 
5. Unknown cocci. Some cocci swollen and stained. 
b. After 1 per cent potassium bichromate. 1. Human tubercle 
bacilli. Bacilli could not be demonstrated by staining. Granu- 
lar remains intensely stained. 
2. Bovine tubercle bacilli. Bacilli could not be demonstrated 
by staining. Granular remains intensely stained. 
