144 G. L. Goodale—Method for subjecting living 
2. Hornblende, Norite. 
No. 117, from the same iron mine north of Cruger’s Station 
as 118, is like this except that it contains an abundance of com- 
pact, dark green hornblende. This is present in good-sized in- 
dividuals without erystal outline. The color is greenish-brown, 
with a trichroism: a=light yellow; b=dark greenish brown; ¢ 
nearly like b. Absorption, acb<e. Around frequent magne- 
tite inclusions the color is generally bleached out to a clear, light 
green. j 
No. 119, from Montrose station, south of Peekskill, is quite 
like the foregoing except that its hornblende is in larger areas, 
often enclosing the other constituents. Its color is brown and in 
its inclusions, pleochroism and general character, it appears to 
be wholly identical with the hornblende described at length as 
occurring in the Cortlandt peridotites. (See this Journal, Jan., 
1886, p 31. 
No. 125 was collected on the road leading S.H. from Peeks- 
kill, directly east of Blue Mountain and just about in the mid- 
dle of Cortlandt Township. In the hand specimen well formed, 
glistening black hornblende crystals are seen to be thickly 
scattered through a grayish groundmass of feldspar and hyper- 
sthene. These hornblende crystals vary in size, the largest be- 
ing 12-15 mm. in length. Other representatives of the horn- 
blende norites are specimens Nos. 50a and 50) from the “ But- 
ler Section,” on the road from Montrose Station to Montrose 
Point, to be described beyond. The amount of hornblende is so 
grea in these rocks that they might perhaps be better classed as 
diorites, and yet so much hypersthene is present that it was 
thought better to place them here. They are very fresh and 
coarse-grained ageregates. The hornblende is of the greenish 
kind described in section No. 117. The hypersthene is in much 
smaller individuals imbedded in the hornblende. 
All of these rocks contain a greater or less quantity of biotite 
and so grade into the next variety. 
(To be concluded.) 
Art. XVII—A method for subjecting living Protoplasm to the 
aclion of different liquids ; by GEORGE L. GOODALE. 
In the studies of Loew and Pokorny, and of Pfeffer, on the 
action of very dilute solutions on living vegetable protoplasm, 
the objects under examination were generally exposed to large 
quantities of the solutions and thence transferred to the field 
of the microscope. It is indispensable in such investigations 
that the living object should be exposed to the action of a large 
quantity of the liquid. 
