aan 
ra 
we 
—1886.] Zovlogy. 391 
As action and reaction are equal and opposite, and normal to 
the falling surface, the inclination in which that surface lies is a 
neutral plane, and no amount of force acting in that plane can 
increase or diminish its downward motion. 
It is obvious that an incident force at any angle whatever from 
any direction above the plane would increase the fall, and at any 
angle or direction from below would diminish it, while in the 
plane, from any direction, its motion would neither be increased 
nor diminished but remain unchanged. 
There would simply be a motion added to the body, in its own 
wey in the direction of the impressed force and proportional 
oit 
I can detect no “error” arising from “a misconception of the 
phenomena of resulting motion.” The body falls with uniform 
Speed, constituting one of the factors of soaring. It is then 
-moyed laterally on an upward incline, which is the other factor. 
_ These result in the level motion of flight in obedience to the law 
of all resultant motions. 
Tt seems like a covert attempt on the part of Mr. Hendricks to 
lodge a perpetual motion scheme with the soaring problem. 
am confident that no such fallacy can be domiciled within its si 
Precincts.—/, Lancaster, 335 Wabash avenue, Chicago. ae 
Zootocica News.—General—The deep-water fauna of Lake 
Leman, if the line between it and the littoral fauna be drawn at 
irty metres, at which depth chlorophyll-forming vegetation 
ey The Limneas and Chironomus larve which inhabit 
the tracheæ 
m. “izes and ages are found at the bottom at the same season. 2 
cet Makes it probable that these larve never attain the perfect © fe 
*» Dut are capable of reproduction by pedogenesis. be 
oe Mammalia Carnivora. are still common in the north of — 
EONA te “ Statistical Year Book” for Finland states that in 
1 Mot less than 85 bears, 128 wolves, 407 lynxes, 4005 10% 
TOTE 
