58 PROCEEDINGS OF SOCIETIES. 
examining the parasitical products of skin diseases, he should be 
happy to afford them two or three hundred cases a week. 
Mr. Stack said—In some prolonged examinations of the 
vinegar plant made under various circumstances, I have found 
nearly all the forms of cells which Mr. Hogg has described as re- 
sulting from the spores or cells generated by certain peculiar 
forms of disease. I paid some attention to the development of 
these fungi, and I was exceedingly pleased to find so distinguished 
an authority making havoc among the numerous species of these 
minute bodies. 1 think it would not be without interest if the 
members would get so easily obtainable a thing as a vinegar 
plant, and, by growing it under different conditions, find these 
different cells all associated with a great quantity of bactrium 
cells as they appeared in one of Mr. Hogg’s experiments. I think 
that experiment confirms the opinion I have expressed, that when 
a large quantity of bactrium cells are associated with yeast cells, 
the acetous fermentation appears to set in. 
Dr. Varuey explained the curative effect of carbonic acid gas 
in certain diseases, and detailed the method of application as pur- 
sued by himself and his late uncle. 
The PresrpEnt, after some remarks on the importance of the 
microscope in pursuing medical inquiries, proposed a vote of 
thanks to Mr. Hogg and Dr. Hunt, which was carried with ap- 
plause ; and announced that the former had promised to present 
to the Society a number of specimens illustrative of his paper. 
The PrestpENT announced the receipt of a paper from Dr. 
Greville, on “ New and Rare Diatoms.” (‘ Trans.,’ p. 1.) 
Dupriixn MicroscoricaL CLus. 
May 18th, 1865. 
Mr. Archer exhibited, from a gathering made near Enniskerry, 
a number of globular, densely spined bodies, with green contents, 
the spines very numerous, very slender throughout, and acute. 
These bodies were generally to be found distributed in pairs over 
the field, and they might easily at first sight be taken for so 
many zygospores of some Desmidian ; but, much as such a struc- 
ture resembled a possible zygospore, these bodies were not like 
that of any known Desmidian, nor was there any evidence in the 
gathering that they might actually be zygospores of any form 
not yet known in the conjugated state. Hence, but for an obser- 
vation made by Mr. Archer on a previous occasion, the source of 
the curious bodies now exhibited would have been not a little 
puzzling. 
In a gathering made (not, however, from the same locality) 
during last year, Mr. Archer had taken a quantity of the rather 
