
I30 THE NORTHERN MICROSCOPIST. 


Woop Secrions.—We have lately received a complete set of 
Dr. Nordlinger’s transverse sections of the most important and 
most common trees. They are adapted to a thorough teaching of 
wood-technology, enabling the observer to distinguish the species 
by means of a very minute portion of it. 
To the teacher these sections are invaluable, for when he is 
engaged with a large number of pupils it is a great aid to be able 
to place in their hands ready-prepared sections for the illustration 
of an oral demonstration. 
We shall be glad to divide our collection, and will forward 
twenty specimens ready for mounting, on receipt of twenty-four 
stamps ; each specimen will make from two to four slides. Collec- 
_tions of one hundred for seven shillings and sixpence. Only a 
limited number can be supplied. 
To NorTHERN SocrETIEs.—Some time ago the following para- 
graph appeared in /Vature :—“‘If the various Northern Societies 
were to do nothing more than prepare local lists of all the varied 
species of animal and vegetable life, which come under the well- 
known denomination of ‘microscopical forms,’ and if Zhe Northern 
Microscopist were to be the medium of publishing these, it would 
become a Journal of importance, one that would be constantly re- 
ferred to; and it would in the meantime be doing a good work in 
advancing the study of the biological sciences.” 
[We shall be glad to help in such a work, as we are of opinion 
that such information would be of greater use than lists of objects 
exhibited at Soireés, etc. | 
TypHoip FEvER Germs.—In Typhoid Fever, the poison is pro- 
pagated in the bowel, and is thrown off with the discharges from it. 
It thus passes from the system in a manner, and in a combination, 
which ensure its speedy removal from the neighbourhood of the 
sufferer. The Typhoid germs are there; but they are mingled 
with discharges which may be removed, and as matter of course 
are removed, before the germs can pass off from them into the 
surrounding atmosphere. The seat of the propagation of the 
Typhoid poison has no direct relation with this atmosphere; germs 
cannot pass directly from the one to the other. 
FATTY DEGENERATION.—With a view of directly observing the 
effect of diminished food supply upon protoplasm, Mr. Cunning- 
ham, some time since, undertook an elaborate series of experiments 
upon easily observable plants and animals, selecting for his purposes 
two common moulds, Choanephora and Pilobolus, and the tadpoles 
of a toad (Bufo melanostictus), and of a frog (Rana tigrina), all 
of which were kept for a longer or shorter period in freshly distilled 
water, and the effect upon their tissues of the deprivation of food 
observed from time to time. 



