210 
CORRESPONDENCE. 
Pere) preparations are well known for their great excellence, and 
several of them are not obtainable, of equal perfection, from any other 
source. C. Eodig's botanical preparations, above all the sections of 
Fungi in situ, are well worth recommending — they are superb. 
J. D. Moller's Flatten are well known, and they are undoubtedly 
marvels of manipulative skill. H. Dalton's arranged scales are 
deservedly admired as " pretty and showy " preparations. Some 
American microscopic specimens are extremely well mounted. 
Moller has recently increased some of his prices to an enormous 
extent, although the quality of his productions has, to say the least, 
remained stationary. Several species of diatoms quoted in his (M.'s) 
catalogue at prices ranging from 2s. to 6s. can be obtained here from 
the different opticians at from Is. to 2s. each, according to the per- 
fection of the specimens and the hands in which they are. Moller may 
be looked upon by some as an authority on Diatomacece, but according 
to Mr. Hickie (' M. M. J.,' No. Ixxix., p. 34), " wrong naming seems to 
be his speciality," and authenticity is not, therefore, the inducement 
to pay the increased prices for M.'s preparations. 
Since this increase of prices has taken place, Moller generously 
offers to the microscopical world to divulge his procedure to prepare 
Diatomaceee, for a corresponding indemnification, by publishing a 
little work, with illustrations, at the moderate price of 32s. 
In such a state of things, one must look for some source whence 
reliable preparations, of excellent quality, and moderate prices, may 
be obtained. 
In regard to the English preparers. Cole and Son, of Liverpool, 
the well-known preparers of Diatomacese, have recently extended their 
productions to series of pathological and physiological preparations, 
which are highly recommended by several authorities. 
Among the physiological series will be found excellent pre- 
parations of the so much looked for injected human cerebellum and 
cerebrum, and many other first-class injections, which will be, no 
doubt, of great interest both to the professional and to the amateur 
microscopist. 
Cole and Son have also produced lately series of Diatomaceae, 
some of the specimens being of great rarity, mounted in their usual 
clean style, at very moderate prices. 
When specimens like the above are met with, there should be no 
fear, when calling attention to them, that the idea of " puffing " may 
be, for a moment, justly entertained. 
I bring the above before your readers, believing that several of 
them do not wish to pay fancy prices, and therefore deprive them- 
selves from adding certain specimens (which they would have bought 
at reasonable prices) to their cabinets. 
I am. Sir, your obedient servant, 
A. DE SOUZA GUIMAEAENS. 
