| FIG. 7. |
| Bacilli from swamp-mud, X 1000 (Sternberg). |
| FIG. 8. |
| Bacilli from septicæmic rabbit, X 1000 (Sternberg). |
| FIG. 9. |
| Bacilli from human saliva, X 1000 (Sternberg). |
| FIG. 10. |
| Bacillus anthracis (Sternberg). |
| FIG. 11. |
| Bacillus tuberculosis, within and outside of pus-corpuscles (Sternberg). |
Spirillum (Spirochæta of Ehrenberg) has its best ascertained example in the minute forms first observed by Obermeier, and afterward by many other observers, in the blood of patients suffering with relapsing fever. They have been found present in the blood only during the febrile paroxysm, disappearing in the intermission and through convalescence.