xx Proceedings. 
of calf; H. Long, Parasite of goldfinch, wheat mildew; K. 
McKean, Larva of beetle; Mr. R. Owen, Fungus; A. D. 
Taylor, Pollen of Godetia; A. Warner, Section of stem of 
exotic fern, stained in two colors; W. L. Serjeant, soap films. 
Ordinary Meeting, Feb. 26th, 1879. 
Joun Fiower, M.A., F.Z.S., President, in the Chair. 
The minutes of the last meeting were read and confirmed. 
Mr. Alfred Russel Wallace was balloted for and elected. 
The PreEsIDENT announced that Mr. G. Corden had 
forwarded to the secretary a copy of a letter written by him to 
the Croydon Advertiser which contained some interesting par- 
ticulars as to the very remarkable thunder storm which broke 
over Croydon on Sunday, June 23rd, 1878, and the letter was 
laid on the table for perusal by the members. (See p. 32). 
He also announced that Mr. Mason, photographer, of George- 
street, had taken three very good photographs of the piece of 
the chestnut tree with the iron chain embedded in it, which 
was exhibited at the soiree, and described at the meeting on 
November 2oth, 1878, and he presented copies of the three 
photographs to the Club. 
He further intimated that the soiree of the Quekett Micro- 
scopical Society would be held at University College, Gower- 
street, London, on Friday, March 14th. 
Mr. H. Turner read an interesting paper ‘‘ On Yeast,” and 
Mr. Henry LEE read a short paper, by Mr. H. Long, who was 
unavoidably absent, on the same subject. 
A discussion took place on these papers, in which the 
President, Mr. H. M. Klaassen, Mr. J. S. Johnson, and others 
took part. Mr. Klaassen solved one of the difficulties felt by 
Mr. Long, by explaining that two varieties of yeast, dis- 
tinguished by the Germans as the ‘ Ober-hefe,”’ or surface 
yeast, and the ‘‘ Unter-hefe,” or sediment yeast, were now 
recognized by naturalists, and explained and described the 
peculiarities of each. Mr. Long’s experiments had probably 
been made with the surface yeast, which, when dried, became 
converted into a ‘“‘tough horny substance,” as described by 
Mr. Long: whereas the sediment yeast, when dried, appeared 
as a fine powder. Mr. J. S. Johnson, at the request of the 
President, also explained how it was that yeast cells were com- 
monly found in some parts of the urinary system of the human » 
body in certain diseases. 
The following objects were exhibited:—Mr. H. Turner, 
