84 
Tlie TuherAe Bacillus^ 
DESCRIPTION OF PLATE I. 
The Tubercle Bacillus in Man and Lower Animals. 
The figures in this plate represent the bacilli in tuberculosis of different animals) 
examined under the same conditions of amplification and illumination, x 1200. 
Fig. 1. — Bacilli in pus from the wall of a human tubercular cavity. In this 
specimen the bacilli are shorter than those in tubercular sputum, and are very 
markedly beaded. 
Fig. 2. — Bacilli in pus from a tubercular cavity from another case in man. They 
are present in the preparation in enormous numbers. The protoplasm occupies 
almost the whole of the sheath, and the bacilli are strikingly thin and long. 
Fig. 3. — Bacilli in sputum from an advanced case of phthisis, showing the ordinary 
appearance of bacilli in sputum — sometimes beaded, sometimes stained in their 
continuity — occurring both singly and in pairs, and in groups resembling Chinese 
letters. 
Fig. 4. — Bacilli in a section from the lung in a case of tuberculosis in man. The 
bacilli in human tuberculosis are found in, and between, the tissue cells, and some- 
times, as in equine and bovine tuberculosis, in the interior of giant cells, but not so 
commonly. 
Fig. 5. — From a cover-glass preparation of the deposit in a sample of milk from a 
tubercular cow. The bacilli were longer than the average length of bacilli in bovine 
tissue sections, and many were markedly beaded. 
Fig. 6. — From a section of the brain in a case of tubercular meningitis in a calf, 
showing a giant cell containing bacilli with the characters usually found in sections 
of bovine tuberculosis. 
Fig. 7. — From a section of the liver of a pig, with tubercle bacilH at tlie margin of 
a caseous nodule. 
Fig. 8. — From a cover-glass jireparation of a crushed caseous mesenteric gland 
from a rabbit, infected by ingestion of milk from a cow with tuberculosis of the 
udder. 
Pig. 9. — From a section of lung in a case of equine tuberculosis, showing a ginnt 
cell crowded with tubercle bacilli. 
Fig. 10. — Prom a section of lung from a case of tuberculosis in the cat, with very 
numerous tubercle bacilli. 
Fig. 11. — Prom a cover-glass preparation of a crushed caseous nodule from the 
liver of a fowl, with masses of bacilli. These are for the most part sliort, straight 
rods, but other forms, varying from long rods to mere granules, are also found. 
Fig. 12. — From sections of the liver and of the lung in a case of tuberculosis of an 
ostrich (Rhea). Isolated bacilli arc found, as well as bacilli packed in large cells, 
colonies of sinuous bacilli, and very long forms with terminal spore-like bodies and 
free oval grains, 
