siders ‘‘to have been derived largely from 
amphibole and olivine.” 
He further says: **Talc schist and chlorite 
schist are developed along with the tremolite 
rock and their association is probably a gen- 
etic one y» y » The occurrenceof these 
secondary phases of alteration on the border 
of the area naturally suggests an igneous con- 
tact.” This latter hint is probably meant 
to refer to the presence of granite, which is 
known to occupy a position close to the east- 
ern border, at the Tompkinsville station of 
the Rapid Transit R. R. 
Following is given as a chemical analysis of 
a specimen from Four Corners: 
SiO 2 , 36.72 
MaiOj: ; ; 29.09 
INO) aye 1.06 
CalOue : 9.95 
HeyZiOrs : 6.59 
Fe O ; : - 1.53 
Cr O03 = Pane : .49 
GiOz 3 ° ‘ ces 2 
H 2 O below r10 C 14.02 
H 2 O above 110 C .14.50 
99.97 
20 
From the facts the author apparently con- 
cludes that our serpentine must be regarded 
as an altered igneous rock. 
II. Discovery of a Mastodon’s Tooth and the 
Remains of a Boreal Vegetation in a Swamp 
on Staten Island, N Y., 
Arthur Hollick, Ann. N, Y, Acad, Sci., 
Xlv. (IQ0I) 67, 68. 
This is practically an elaboration of the 
papers printed in our Proceedings for Oct. 
14, 1899 and Feb. Io. 1900. It refers to the 
mastodon’s molar found in the swamp in 
Moravian Cemetery. 
MINOR NOTES. 
Dr. Arthur Hollick exhibited specimens of 
leaves of plantain, sweet clover and other 
herbaceous plants bleached to a greater or 
less extent, presumably by the action of sul- 
phur vapors from the copper warks on Con- 
stable Hook during the recent wet weather, 
The leaves were collected on Kissel Ave,, 
West New Brighton, where all the vegeta- 
tion was more or less affected 
Mr C. A Ingalls exhibited a series of pho- 
tographs of Staten Island scenery, part mount- 
ed on cards and part prepared in the form of 
lantern slides. 
