906 
PROCEEDINGS OF THE SOCIETY. 
by Mr. H. Sharp, of Adelong, New South Wales, about eight years ago ; 
the tongue is mounted in a saturated solution of biniodide of mercury 
in a saturated solution of iodide of potassium, and is similar to one 
shown at the R.M.S. in November 1884.” 
The Chairman said that he could not be sure, from the cursory 
examination he had been able to make, that the exclamation marking 
referred to in the letter was to be seen, but the photographs of the blow- 
fly's tongue were certainly remarkably good. 
Prof. Bell said that Mr. Nelson — to whom these photographs were 
originally sent — had written a letter much to the same effect, recom- 
mending them to the notice of the Society, and practically agreeing with 
what Mr. Karop had just said. 
Dr. C. E. Beevor read a paper “ On Methods of Staining Medullated 
Nerve-fibres,” illustrating the subject by photomicrographs, and by a 
number of preparations exhibited under Microscopes in the room 
(see p. 897). 
The Chairman said they were much indebted to Dr. Beevor for his 
very interesting paper. Most of the processes mentioned had been 
described from time to time in the Journal of the Society, but now 
they had an excellent resume, which would no doubt be very useful to 
refer to. It was of course a very good thing to be able to differentiate 
nerve-fibres in the ways which had been described, but it was a pity 
that they could not also so differentiate them as to show from which part 
of the nervous system they came. If this could be done he need hardly 
say it would be of great value, but he supposed it was rather beyond 
them at present. 
The thanks of the meeting were unanimously voted to Dr. Beevor 
for his paper. 
Prof. Bell said that the next paper on the Agenda was one by Mr. G. 
Massee “ On Heterosporium asperatum .” It was printed in the number 
of the Journal just issued, with a plate in illustration, but he had hoped 
that Mr. Massee would have been present at the meeting to have pointed 
out to them by means of diagrams the chief points of interest in his 
paper. In his absence the paper would be taken as read (see p. 577). 
Dr. H. G. Piffard’s letter “ On the use of Monochromatic Yellow 
Light in Photomicrography,” was read by Prof. Bell (see p. 868). 
The Chairman expressed the indebtedness of the Society to D>r. 
Piffard for his interesting communication upon a subject which was 
receiving a good deal of attention at the present time. 
Mr. T. Charters White said he should very much like to see some 
of the results of the procedure which had been described in this paper, 
because he had himself tried a very similar process with monochromatic 
light obtained by using screens and solutions, but the chief difference 
he found was that it very much prolonged the time necessary for 
exposure. When he used a solution of copper as a screen he found 
that a ten minutes’ exposure gave no result whatever, and that with an 
