79 
leave his workshop in Paris, we know of none we can re- 
commend so highly. We may mention that Dr. Car- 
penter has spoken to us very favorably of the 4th. The 
price of Gundlach’s immersion powers is less than half what 
Hartnack charges for the same number ; but we can not say 
that the specimens of Gundlach’s immersions which we 
have seen at all equal Hartnack’s. Probably some of 
Gundlach’s higher lenses are very much better than others. 
A =1,th, at five pounds eight, which we have examined, 
gave good working distance and light but was wanting in 
sharpness. We feel it is only fair to give all publicity to so 
laudable an attempt as that of Mr. Baker in introducing 
cheap glasses of high power to the English market ; it must 
have a beneficial effect on the work of our own makers, and 
if insular prejudice can be removed, microscopists will find 
that their pockets are saved and their powers greatly extended 
by these admirable objectives. 
New Work on the British Diatomacee.—Dr. Donkin, a 
valued contributor to this Journal, has undertaken to bring 
out with Mr. Van Voorst a ‘ Natural History of the British 
Diatomacee.’ As yet only the first part has appeared, so 
that we cannot speak of the merits of the work. We hope 
in succeeding numbers to see more natural history in its 
wide sense. 
Dr. Gumbel on Bathybius.—Reports have appeared in one 
or two English journals as to researches on Coccoliths and 
on Bathybius, by Dr. Giimbel of Munich. His results must 
be very much modified by the observations of Haeckel, of 
which we give a notice. Dr. Gumbel has asserted the occur- 
rence of coccoliths in older sedimentary rocks than the chalk, 
and also has said that Bathybius occurs in shallow seas every- 
where. No evidence of these facts has, however, been given 
of a detailed kind. 
The Government Investigation of Cholera-fungus. — Dr. 
Timothy Richard Lewis, one of the commissioners recently 
appointed by the Government to study cholera in India, and 
who first of all proceeded to Halle and Jena to make himself 
acquainted with the views of De Bary and Hallier, has pro- 
duced a very beautiful set of drawings (published by the 
Indian Government) of appearances, fungi, epithelium, and 
various other structures, seen in cholera-stools and in fungus- 
‘cultivation experiments. He gives no very positive con- 
clusions, but lays his evidence fully before the public in a 
most creditable manner. ‘The summary of these experi- 
ments given by Dr. Lewis is, however, not favorable to the 
views of Hallier. 
