2'2S TiiC American (ieoloijist. October, 1S95- 
human capacity arc all considered. It loses in breadth, but it 
f:;ains in the j>'reater interest and consequently greater depth 
of the work done. 
Much can be said in favor of both systems, as the writer 
knows from long experience with both ; but there is one point 
that ought to be the controlling factor in every engineering 
school in deciding what it will do for the future. If the signs 
of the times and the history of education are read aright this 
is true and certain, that whether we like the elective principle 
or not, whether we are willing to adopt it or not, every engi- 
neering or technical school in the land must and will adopt 
it in its entirety, sooner or later, or else perish. It needs no 
Daniel to read the handwriting all over our walls. 
ROCK HILL, LONG ISLAND, N. Y. 
By John Beyson, Eastport, L. I. 
(Plate XII.) 
Rock hill derives its name from a huge boulder which 
crowns the summit of the ridge — the terminal moraine of 
geologists — about two miles north of the village of Eastport, 
on the Great South bay. 
The boulder, though less than half its original size, is still 
a very respectable erratic, as may be seen by the picture ac- 
companying this paper. It is a block of feldspathic granite, 
and the present measurement is about 50 by 20 feet. Judg- 
ing from the size of the hole, which is partially seen to the 
left of the rock in the picture, from which the rock has been 
quarried, it must have been originally more than 125 by 20 
feet. A good deal also has been blasted from the face of the 
boulder; one of the drill holes is visible at the feet of the 
figure on the top of the erratic. 
Although exposed to the blasts from the ocean and the 
weathering of many centuries, some faint lines of glacial 
strije can still be detected on the upper surface of this erratic 
block. 
The moraine at this point is very liuviatile in character,, 
only a few inches of loam covering the water-worn material, 
mostly quartz pebbles. It would seem at first as if the huge 
boulder had been dropped by floating ice, but a study of all 
the phenomena connected with it hardly permits this inter- 
pretation. It is not reasonable to suppose that icebergs would 
