354 IN MEMORIAM—GEORGE BROOK. 
with Mr. W. Denison Roebuck, of the Yorkshire Naturalists’ Union, on 
the occasion of the conversion of the old West Riding Consolidated 
Naturalists’ Society into the wider ‘ Union,’ a post which he held 
continuously until the end of 1881. 
Somewhere about the year 1878 or 1879 the late Mr. Jas. W. 
Davis, F.L.S., whose lamented death during the third year of his 
Mayoralty of Halifax occurred only a few weeks before that of 
Mr. Brook, invited a few scientific friends to his house, and then 
and there Messrs. Davis, Wm. Cash, F.G.S., George Brook, F.L.S., 
W. Percy Sladen, F.L.S., C, P. Hobkirk, F.L.S., and John Stubbins 
formed themselves into a ‘close club,’ calling themselves the ‘ Bios,’ 
for the more careful study of biological science and the problems 
connected with the life of both animals and plants, the meetings 
being held monthly at each other’s houses—a union which was 
always pleasant, agreeable and instructive, and was only broken up 
about 1886, owing to several of the members having left the vicinity. 
In the early part of 1878 a disease appeared on the Salmon in ~ 
the rivers Eden, Esk, and others, and Mr. Brook having received _ 
a diseased fish, sent for the writer of this memoir to assist him in 
‘the investigation of the disease, which was found to be caused by 
a micro-fungus, Achlya (Saprolegnia). Mr. Brook read a paper — 
on the. subject before the oe Scientific Club, which was — 
published i 
Edinburgh,’ rzth June, 1879, in reply to one published in the same 
journal by Mr. A. B. Stirling. S 
About Christmas, 1884, Mr. Brook, having eS from ie | 
father’s business, received a scientific appointment under the Scottish > 
-d from this post in. 1887. During this eriod 
also received the. appointment of Lecturer on 
Edinburgh University, which. he held until his deatt 
other papers published by him in various scienti 
elo Hat De ae Bayra ruhbdn 
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