NORTHERN SOCIETIES. gI 
another cell which has been treated with iodine, whereby the 
protoplasm has been stained yellow, the nucleus being distinctly 
exhibited. A third figure shows the effect of iodine and sulphuric 
acid combined, under which reagents the cell-wall becomes blue 
and the protoplasm coagulated, while another cell having been 
treated with potash is shown empty, the alkaline solution having 
dissolved the albumenoid contents. 
This differentiation of tissues by the aid of certain chemical 
reagents is most valuable in its applications to microscopical 
research, and the sooner the student appreciates the fact that the 
mere placing of an object upon the stage of the instrument and 
looking down the tube upon it, is not of much practical value, 
the better it will be, not for himself only, but for the interests of 
that science to which he essays to devote himself. 
It is not only amongst the Protophytes that the excellent 
illustrations will aid the beginner. Plate VIII. is devoted to the 
Histology of flowering plants and from it may be learnt the value 
of double and treble staining. Passing now to the animal world 
we find Plate IX. devoted to Ameba and Vorticella, and upon 
Plate X. Hydra viridis and Hf. fusca, all of which are within the 
reach of almost anyone. 
Higher up in the scale of life we have illustrations of dissections 
from the earth-worm (Lumbricus terrestris), the lobster (Homarus 
vulgarts ), the crayfish (Astacus fluviatilis ), the fresh-water mussel 
(Anodonta cygnea), the edible snail (Helix pomatia), winding up 
with a set of dissections from Rava esculenta, the edible frog. 
We cannot speak of the work but in terms of praise, and we hope 
that through the medium of this notice it may find its way into the 
hands of those who have microscopes lying idle. 
NORTHERN SOCIETIES. 
BOLTON Mrcroscorrcat Society. Hon. Sec.: Mr. W. Rideout. Meets on Friday 
evening once in each month. 
CHESTER Natural SCIENCE AssociaTION. Hon. Sec. of Microscopical Section: 
Mr. J. D. Siddall. 
DONCASTER Microscoricat Society. Hon. Sec.: Mr. M. H. Stiles. Meets on 
March 6th and 20th. 
HALIFAX. A Private Society. Members meet at each others houses. 
LEEDS. No Microscopical Society in existence. 
LIVERPOOL Microscoricat Society. Hon. Sec.: Mr. I. C. Thompson. Meets 
First Friday in each month. 
MANCHESTER Mrcroscoricat Society. Hon: Sec.: Mr. C. L. Cooke. Meets 
First Thursday in each month. 
MANCHESTER Cryptocamic Society meets Third Monday in each month, at Old 
Town Hall, King Street. 
MANCHESTER Science AssoctaTion. Hon. Sec.: Mr. J. Percival Yates. Meetings 
Second and Fourth Tuesday in each month. 
NEWCASTLE-ON-TYNE. Norru or Encianp Microscoricat Society. Hon. 
Sec.: Mr. M. H. Robson. Meets Second Wednesday in each month. 
