274 PEOGRESS OF MICROSCOPICAL SCIENCE. ['Slai.Sn^iS' 
paper on tliis subject. He says that we may distinguish in the cere- 
bellum of the infant five layers, one of the character of connective 
tissue, and the others of nervous substance. The cells of Purkinje 
exist at that period in the fourth layer. In the fully-formed cere- 
bellum we distinguish the basal layer, the exclusively grey layer, the 
universal cellular layer, and the rusty-coloured layer. Purkinje' s cells 
present some differences, according as they are situated at the summit or 
bottom of a convolution, and notwithstanding their innumerable rami- 
fications of extreme fineness, all the processes of the same cell extend 
in a plane vertical to the longitudinal direction of the bourrelet. Both 
cells and their processes bear characteristic striae. — L'Institut, Sep- 
tember 22. 
The Fossil Bryozoa of Bessarabia formed the subject of a paper 
presented to the Academy of Science of Vienna, at the meeting held 
in June, by Herr Eeuss. Some of the Oolitic deposits of a porous 
character, and composed in great part of shells, enclose the remains 
of Bryozoa in large quantity. The author found four species, two of 
which — Semieschara variabilis and Diastopora corrugata — were remark- 
able by the extreme variety of their forms. 
Tuberculous Deposit in the Tissues. — The eleventh report of the 
Medical Officer to the Privy Council contains a most admirable 
paper (of great length) by Dr. Burdon-Sanderson on his experi- 
ments in inoculating tuberculous matter. It is illustrated by a 
multitude of beautifully-tinted lithographs, showing specimens of 
various tissues containing the tubercular material as an interstitial 
deposit. It is most creditable to Mr. Simon that such good work 
should be done in his department. 
Noberfs Lines Photographed. — The last number (September) of 
Silliman's 'American Journal' contains a brief paper on the above 
subject by Col. Woodward. As the facts have, however, been already 
brought under the notice of the Eoyal Microscopical Society at its 
last meeting, in a paper which shall appear in our next issue, it is 
unnecessary to refer further to the matter. 
Bain-water under the Microscope. — ' Scientific Opinion ' (October 13) 
has extracted with illustrations some remarks of Dr. Angus Smith, 
F.R.S., on the microscopical examination of rain deposits. The 
subject may be of interest to certain of our readers. 
Cells within Cells. — In the notes to his French edition of the 
' Fertilization of Orchids,' which Mr. Darwin has recently prepared, 
he gives the following account of his attempts to enumerate the pollen- 
grains of one flower : — " I have endeavoured," he says, " to estimate 
the number of pollen-grains produced by a single flower of Orchis 
mascula. There are two pollen-masses ; in one of these I counted 
153 packets of pollen ; each packet contains, as far as I could count, 
by carefully breaking it up under the microscope, nearly 100 com- 
pound grains ; and each compound grain is formed of four grains. 
By multiplying these figures together, the product for a single flower 
is about 120,000 pollen-grains. Now we have seen that in the allied 
0. maculata a single capsule produced about 6200 seeds; so that there 
