145 
some attempt being made to record such phenomena perma- 
nently by means of photography. It seems to me also 
equally certain that pictures of greater dimensions such 
as the instrument suggested would give would be propor- 
tionally more valuable than any hitherto obtained. 
The photographic process used has always been the wet 
collodion. It might be advantageous to use daguerreotype 
plates, but I see no reason why both methods should not be 
employed. 
MICROSCOPICAL AND NATURAL HISTORY SECTION. 
April 12th, 1875. 
Joseph Baxendell, F.RA.S., in the Chair. 
Mr. Arthur W. Waters, F.G.S., presented the section 
(for the cabinet) with the following slides 
Diatomaceous earth from Billin, in Bohemia, full of Gallionella 
distans. Ehr. 
Diatomaceous earth from Berlin. 
Spicules of Alcyonium digitatum, from Brighton. 
Dr. Alcock read a paper on the occurrence of Hyperia 
Galba, and Lestrigonus Kinahani, crustaceans parasitic upon 
Medusae, at Southport, on a sand bank called the Seldom 
seen” Bank. 
A paper was read on the Mollusca, &c., inhabiting Cym- 
meran Bay, Anglesey, by Mr. J ohn Plant, F.G.S., &c. 
Cymmeran Bay is a deep indent on the western coast of 
Anglesey^ At the head of the bay is the strait which 
