NOTES AND QUERIES. 321 

to saturation with galls hot, there will be exhibited a dark bluish 
grey inner circle with an outer blackish blue ring, which latter may 
also be seen in dyeing blacks having a ground of Prussian blue. 
The black in this case, again, does not reach the centre. 
IMBEDDING IN Paper puLP.—In the August number of the 
Journal of the Royal Microscopical Society is given a simple plan 
of imbedding tissues for Microtome cutting by B. W. Richardson. 
Strips of white unglazed paper are dipped in water and rolled 
tightly round the structure to be embedded until a plug is formed 
requiring some little pressure to send it home in the microtome 
well. The strips of paper should be of a width slightly exceeding 
the length of the structure to be cut. This method is more suit- 
able for vegetable than for animal tissues, but’ Dr. Richardson has 
found it successful with the latter also. Stems of plants should 
be previously soaked in methylated spirit for a few weeks and 
animal tissues in whatever fluid is most suitable for their preserva- 
tion, and, if necessary, for their hardening, as the structure must be 
of sufficient firmness to stand being pushed home in the microtome 
well. J. R. M. S., Aug., 1882. 
MANIPULATION. —I have lately found that the best way of raising 
a micro. cover glass and putting it on the slip, is by means of 
suction from the mouth through a piece of glass piping, with a 
small piece of rubber tubing at one end. By inhaling through the 
glass pipe, the cover glass will cling to the rubber énd, and can 
thus be transported anywhere, and deposited by ceasing the 
suction. ‘The cover is thus prevented from being soiled or broken. 
I have applied a modification of this method for lifting small 
and light objects without injuring their structure, ze. :-—-A glass 
tube drawn out to a very fine point, with the smallest conceivable 
hole through it; a slightly curved tube is the best form. 
I am not aware that the method has ever yet been made use of. 
Perhaps microscopists will try it—J. Tertius Woop. 
Srupres tn MICROSCOPICAL ScIENCE.—Since our last notice, 
nine more numbers of this weekly periodical have been issued, 
containing the following chromo-lithographs :—Human Kidney— 
horizontal section of papillary portion ; transverse section of aérial 
stem of the Field Horse-tail (Zgussetum arvense) ; vertical section 
of Human Kidney; transverse section of root of Dandelion 
( Taraxacum officinale) showing a portion of the Xylem, and also 
bast and cambium x 700; section of the bronchus of a sheep in 
lung tissue; section of stem of Lycopodium Wildenovit ; vertical 
section of Human Lung; section of stem of Pilularia globulifera ; 
the last number (23) being illustrated by a representation of a ver- 
tical section of the lung of a cat, injected with carmine. 
