552 
D. E. SALMON. 
phytae present themselves in different shape and form.” The 
simplest form is that of a micrococcus. The second form is bi- 
spherical; the spherical cell has grown and become contracted, 
or indented in the middle, forming two united granules. 
“ These bispherical schizophytae are always more or less nu¬ 
merous, are either at rest or moving, and usually provided at one 
end with a flagellum or post-flagellum, which, however, is so ex¬ 
ceedingly fine that I have never seen it except with the tV homo¬ 
geneous immersion objective of Tolies, and an amplification of 
over 1,500 diameters, and then only while the schizophytae was 
moving.” * 
He then goes on to describe the formation of a chain of 
bispherical elements, and mentions the existence of zoogloea 
masses/as well. He had not yet given up the rod or bacillus 
form; for he states that in the blood and pleural exudation, 
when a day or two old, and sometimes while yet fresh, rod-shaped 
bacteria can be observed ; and it appears probable that the same 
constitute another form of the swine-plague schizophytae. | 
The same volume contained a report of mine in which are 
detailed certain experiments and observations on the schizophytes 
peculiar to this disease. In this report was given a description of 
the first successful attempts, as I believe, to demonstrate what 
micro-organisms, if any, existed in the blood and other liquids of 
living hogs sick with swine-plague. To keep the liquids to be 
examined free from all suspicion of contamination, vacuum tubes 
were prepared by drawing to a point the two ends of a small 
piece of glass tubing about a fifth of an inch in diameter. A 
drop or two of water was then aspirated into this tube, boiled to 
secure a vacuum, and the ends immediately sealed. The tube 
was now heated to redness to destroy any bacteria spores that 
might still be in it, and it was ready for filling with the virulent 
liquid. In use, a very sick hog was killed, a vein laid bare, some¬ 
times before the animal was quite dead, the vacuum tube was 
passed through the flame of an alcohol lamp, the finely drawn-out 
end forced into the vein and broken across its walls, when it 
would immediately fill, and was sealed in the lamp as soon as 
* Loc. cit., p. 187. 
t Loc. cit., p. 188. 
