ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
801 
interesting of which is trypsin — the pancreatic ferment. A great 
number of bacteria secrete this ferment, and of this number are the 
photogenic pepton-bacteria. 
Bacteria found in Beer.* * * § — Herr A. Zeidler isolated from beer which 
had become cloudy a bacterium haviftg the appearance of Bacterium 
termo and the following characteristics: — In wort-gelatin and also in 
meat-juice-gelatin, along the inoculation-track dirty yellow granular 
colonies. After some days the gelatin was liquefied. On beer-wort-agar 
the track was more yellow ; on potato there formed a dirty yellowish- 
brown overlay. After having been inoculated in beer- wort, on beer, in 
fermenting wort, and on yeast alone, it was found that it would developo 
provided that the amount of alcohol did not exceed 3 per cent. ; but that 
in general it was easily overmastered by the yeast and quickly died 
after alcoholic fermentation was fairly set up. 
Experiments were also made with two other bacteria, one of which is 
apparently identical with Bacterium aceti , while the other corresponds 
with no hitherto described micro-organism. The behaviour of both in 
cultivation was very similar although there were certain constant specific 
differences. Their common characteristics were that they acidified beer 
and set up a viscid, mucoid condition therein. 
Pathogenic Bacteria obtained from the mud of the Lake of 
Geneva, j — M. Lortet isolated from the mud of the Lake of Geneva 
numerous micro-organisms amongst which were Staphylococcus pyogenes 
aureus, Streptococcus pyogenes, Bacterium coli commune , and the bacilli of 
tetanus and typhoid, and it is interesting in this connection to note that 
the water of that part of the lake from which these microbes were obtained 
is chemically a very pure water. Like other bodies these minute exist- 
ences are subject to the law of gravity, sinking through the water to the 
surface-mud of the lake-bottom, and there preserving their vitality for 
probably lengthy periods, at a constant temperature of 4 * 5°. 
Bacillus pygogenes foetidus.J — Dr. E. Burci isolated from a sup- 
purating hydatid cyst of the liver a micro-organism which, by a series 
of experimental investigations, he identified as being the Bacillus 
pyogenes of Passet, and he further claims that he has shown this bacillus 
to be truly pyogenic. After discussing its more important morphological 
and biological characteristics, the pathogenic properties of this microbe 
are referred to in detail. In the first place it is shown that it possesses 
the power of causing the production, locally, of pus, and that the general 
effects are peritonitis, enteritis, infarction of liver, and slight swelling 
of the spleen. 
The author then proceeds to show the effect of temperature on its 
virulence, the results from inoculation of the cultivation products, the 
acidification of the medium, and of variation of the medium. 
Bacillus lactis viscosus.§ — This bacillus, first discovered by the 
author. Prof. L. Adametz, in water, is now found' to be the exciting cause 
* Wochenschr. f. Brauerei, vii. (1890) No. 7. See Bot. Centralbl., xlvi. (1891) 
pp. 95-7. f Centralbl. f. Bakteriol. u. Parasitenk., ix. (1891) pp. 709-10. 
X Ann. de Micrographie, iii. (1891) pp. 401-15. 
§ Berliner Landwirthsch. Jahrb., 1891. See Centralbl. f. Bakteriol. u. Para- 
sitenk, ix. (1891) pp. 698-700. 
