206 
POPULAR SCIENCE REVIEW. 
anemometer itself is a circular box, 11 in. diameter and 2^ in. deep, which 
moves freely on its centre on a pivot at the top of a rod fixed firmly into a 
foot plate, so as to prevent oscillation. The box is horizontal, provided with 
a space on one side, in which is placed a well-tempered steel spring, which 
gives a range of in. from zero to what represents 40 lb. pressure on the 
square foot. To this spring is attached a brass rod, or rack, which works 
the pinion, on the axle of which are placed two fingers, one live and the 
other dead. These fingers move according to the pressure given (or move- 
ment of the pillion), and thus the force is shown by looking at the dial- 
plate ; and the figure to which the live finger points shows the present 
force of the wind, whilst the dead finger is opposite the figure, showing the 
maximum pressure that the wind has attained during a given period. This 
is effected by a small pivot, or pin, at the point of the dead finger projecting 
above the live one, so that as the live finger is forced by the pressure it 
carries the other with it, and leaves it at that point if the wind decreases. 
In front of the spring, in the space ah’eady referred to. is a small disc 
attached to a rod, on which is placed a wind-plate of 6 in. square. This 
plate is kept to the wind by a vane on the opposite side of the circular box, 
and as its area is just one-fourth of a square foot, the graduated' dial 
figures being multiplied by four, gives the same result as though the plate 
were a foot square. This size of plate gives lightness, and reduces the 
friction to a minimum. The working parts of the instrument are protected 
from the weather by a glass lid or cover. 
MICROSCOPY. 
The Monthly Mici'oscojncal Journal constitutes one of the most important 
features of the quarter in this department. A glance at it shows that the 
Fellows of the Royal Microscopical Society receive a much larger return 
for t'leir subscription than they did under the reyime of the old journal, 
which was published quarterly. For example : let us compare, what are 
strictly comparable, the January number of the Quarterly Journal of Micro- 
mopical Science and the numbers for .Fanuary, February, and March, of the 
Monthly Microscopical Journal. The first contains some ten or eleven articles, 
all good in their way. The contents, merely in original contributions, of the 
three latter are as follows : — 
January . — Structure of Papilhc and Termination of Nerves in Muscle of 
Common Frog’s Tongue. By Dr. R. L. Maddox. Witli Plate. — Re- 
lation of ^Microscopic Fungi to Cholera. By Dr. .1. L. W. Thudicum. 
— lleliostat for I’iioto-Micography. By Dr. R. B. Maddox. With 
Plate. — lleliostMt for Plioto-Micography. By Lieut.-Col. .1. .1. Wood- 
ward, M.D. U.S. Anny Medical Department. With Plate. — A Modi- 
fication of the Binocular Telescope. By M. Nachet. Illustrated. — 
The Vital Functions of the Deep Sea Protozoa. By Dr. G. C. Wallich. 
— The Formation of the Blastoderm in Crustacea. By MM. Van 
Beneden and Bessels. 
