334 THE MICROSCOPICAL NEWS. 
which I experimented recently, gave excellent results. It is pre- 
prepared as follows :— 
Picric acid (cold saturated solution in distilled water) 100 volumes 
Sulphuric acid (concentrated) ... .....- 1.2 22 Sioa 
Filter the mixture, and dilute it with three times its bulk of water. 
The use of this reagent is attended with much less difficulty than 
that of alcohol. If the subject of the experiment is a Zoophyte, 
such as Aglaophenia pluma or Plumularia setacea, it must be 
allowed to remain some hours until the polypides are fully extended. 
Kleinenberg’s Fluid must then be introduced by means of a 
dipping tube. It may be allowed to flow over the specimens in a 
continuous stream, until the whole of the water assumes a golden 
yellow colour. The reagent causes instant death, so that the 
specimens may be transferred immediately to 60 per cent., and 
afterwards to 75 per cent. alcohol, allowing them to remain in each 
solution for some hours. Keep in go per cent. alcohol. From 
four to six minutes immersion in Martindale’s Picro-carmine 
Staining Fluid is sufficient to stain specimens killed by either of 
the above methods. 
To the Editor of “The Microscopical News.” 
DEAR S1r,—My attention has been called to a paragraph in the 
last number of your Journal, referring to a note in the previous 
number wherein you appear to have given credit to a Mr. Quinn 
for bringing out some Micro. Labels, while in the last number you 
divide the credit between Mr. Quinn and myself. 
It would certainly appear a rather curious coincidence that two 
people should separately bring out a set of labels precisely similar 
both as to special colours and matter of each, and at precisely the 
same time; and before giving a sketch of each I think you might 
with advantage have ascertained whether they had not one com- 
mon origin. ‘To convince our readers that such is the case I can 
only refer to Mr. Wilkinson, of Pendleton Printing Works, to 
whom I handed all my original sketches of the labels—three being 
for myself, and two for the Microscopical Society of which I am 
Hon. Secretary. 
Upon enquiry I find that Mr. Quinn saw these labels while in 
the printer’s hands, and that he at once procured almost exactly 
similar ones, and of the same colours, and I am rather surprised 
that he should not, through your columns, have corrected your error. 
I would gladly have sent you copies of these labels at first, but 
that a full abstract of my explanatory paper, entitled “On the 
Classification and Labelling of Microscopical Objects,” was sent to 
another paper, where it appears in the present month’s issue. 
