89 
suggestive ; he had noticed that fresh blood discs (for instance 
from a pricked finger) were not immediately affected by 
Magenta, but that some little time was required for the dye 
to permeate the envelopes. 
Mr. Nevill exhibited a new form of cell cut out in card- 
board, containing seven divisions for seven different objects ; 
it is very suitable for Foraminferse, Diatomacese, &c., and 
may contain seven species, which will economise space 
in cabinets and facilitate exhibition. The perforations are 
about j of an inch in diameter, and are made with a saddler’s 
hand-punch ; the disc is then covered with black varnish and 
secured to the glass slide. 
Mr. J. B. Dancer exhibited new cells for opaque objects 
of various sizes; they are made of composition, and are cast 
in a mould. 
Mr. J. G. Dale exhibited with the polariscope, crystallised 
films of Santonine, and of Picrate of Aniline ; they are 
very rich in colour, and some of the forms are believed to 
be new. 
MATHEMATICAL AND PHYSICAL SECTION. 
Annual Meeting, March 5th, 1863. 
Joseph Baxendell, F.R.A.S., Vice-President of the Section, 
in the Chair. 
On the motion of Mr. Atkinson, seconded by Mr. Dickin- 
son, it Avas resolved that Rule 4 be altered by adding the 
following words : “ No person shall hold the office of President 
for more than two years in succession.” 
