tia Gravitation and the Soaring Birds. ` [June, 
on the Peace river,’ and “ Note on a decapod Crustacean from 
the Upper Cretaceous of Highwood river, Alberta, N. W. T.” 
R. P. Whitfield contributes to Science, Vol. vi, p. 87, “An 
American Silurian scorpion.” In the Bull. Amer. Mus. Nat 
Hist., October 10, 1885, Vol. 1, No. 6, pp. 181, 191 and 193, he 
has the following articles: “ On a fossil scorpion from the Silu- 
rian rocks of America ;” “ Notice of a new Cephalopod from the 
Niagara rocks of Indiana ;” “ Notice of a very large species of 
Homalonotus from the Oriskany sandstone formation.” 
H. S. Williams, in the Proc. A. A. A. 5., Vol. XXXII, Part 11, 
p. 422, publishes an article on “ Geographical and physical condi- 
tions as modifying fossil faunas.” In the Amer. Jour. Sci., 3d ser., 
Vol. xxx, p. 45, he has a “Notice of a new limuloid Crustacean 
from the Devonian.” 
A. Winchell, in the Amer. Jour. Sci., 3d ser., Vol. XXX, pp. 316 
and 317, has “ Notices of N. H. Winchell on Lingula and Para- 
doxides from the red quartzites of Minnesota,” and “On Coenos- 
troma and Idiostroma and the comprehensive character of Stro- 
matoporoids.” 
N. H. Winchell describes “Fossils from the red quartzites at 
Pipestone” in the Geol. and Nat. Hist. Surv. Minnesota, 13th 
Ann. Rep., p. 65. 
H. H. Winwood, in the Geol. Mag., new series, Decade 11, 
Vol. 11, p. 240, remarks on the “ Geological age of the Rocky 
‘mountains ;” in it he reports finding a Menevian fauna” betwee? — 
the 116th and 117th parallels of longitude on the Canadian Pacific 
railway. 
B. H. Wright, in the 35th Rep. N. Y. State Mus. Nat. Hist., p. 
195, contributes “ Notes on the geology of Yates county, N. Y. 
:0: 
GRAVITATION AND THE SCARING BIRDS. 
| BY I. LANCASTER. 
Be experimental philosophy, all propositions collected by 1° 
_ 4 duction from phenomena are to be held either exactly oF 
: approximately true until other phenomena are found by which 
those propositions can be made either more accurate Or subject 
to exceptions” (Newton’s Principia, Book 111). 
o > The soaring birds seem to be excused from obedience to the 2 
_ Jaws determining the actions of other inert bodies heavier tham 
