SCIENTIFIC NEWS. 
From 1885 to 1888 the regretted Professor Cienkowsky prac- 
tised (in Russia) 20,310 vaccinations against charbcn in sheep. 
The average loss was 0.87 per 100. In a flock of 1 1,000 sheep, 
the ordinary mortahty amung which was 8.5 to io;6, the mor- 
tahty after inoculation fell to 0.13 per 100. In another case, 
thirteen months after the preventive inoculation, 18 sheep out 
of 20 resisted the action of virulent charbon. 
At the international exhibition of geographical, commercial, 
and industrial botany, which will be held at Antwerp, in 1890, 
the third centenary of the invention of the microscope will be 
celebrated. The exposition will illustrate the past history of 
the microscope and its present state by means of microscopes 
and microscopical appurtenances of past and present times, as 
well as by photo-electrical microscopical exhibitions showing 
the history and uses of the microscope, animal and vegetable 
structure, and adulterations of food, etc., etc. These exhibi- 
tions will continue during the entire period of the Exposition. 
The next meeting of the British Association for the Ad- 
vancement of the Sciences will be held at Newcastle, (England), 
from September nth to i8th. 
A Congress of Zoologists will be held in Paris during the 
Exposition, in the month of August. Among the patrons as 
announced, appear the names of men of all nations. 
On the shores of Lake Issik-Kul in Central Asia a monu- 
ment is to be erected to the explorer Prjevalsky, after a design 
by Bilderling, his comrade. According to the Invalide Russe 
" the monument represents a picturesque rock 28 feet high, on 
the top of which is perched a large eagle, emblem of strength, 
intrepidity, and intelligence. The eagle grasps in its talons a 
map of Central Asia, the arena of the scientific exploits of the 
deceased, and in its beak an olive branch, symbol of the peace- 
ful scientific conquests which Russia owes to Prjevalsky. On 
one side of the rock is a large bronze cross, between which is 
the inscription, ' Nicholas Mikhailovitch Prjevalsky, born 29th 
of March, 1839, died 20th of October, 1888.' In the interior 
of the rock is cut a spiral staircase crowned with an enlarged 
copy of the medal struck by the Academy of Sciences in 1887 
in honor of Prjevalsky, and showing the original inscription : 
' To the first explorer of Nature in Central Asia.'" 
