230 Scientific Intelligence. 
impressions or interior casts. Owing to the small size of the 
enclosing masses e rocks 
fossils ordinarily are much decayed, but testinal specimens are 
obtamed in fine condition. Among the scanty drift upon the 
upper third of the Southwest Slide, I have never seen a fossil- 
bearing stone. And upon those parts of the summits where drift 
was found, only once was a fossil met with,—a solitary Brachiopod 
impression on a ten-pound piece of sandstone, picked up on the 
slope northward from West Peak to the Saddle, about 600 feet 
below the top of the i or at an elevation of about 4,615 feet 
ove the sea. This is by far the highest point at which fossil- 
iferous rocks have yet been found upon Ktaadn.* 
All the facts in the case serve to indicate that the non-granitic 
material found upon the mountain is a portion of the so-called 
“northern drift,” with the fact of whose Getciahounivt the 
ner—we are here concerned. But we may and must suppose 
up at least as 4,600 feet, received deposits of drift more or less in 
quantity. 
4, Doleryte (trap) of the Triassio-Jurassie area of astern 
North America.—Dr. G. W. Hawes, using Thoulet’s method of 
se aca associated minerals, through their difference in specific 
gravity, by means of a mixture of potassium iodide and mereury 
iodide in solution, has siyomuipaled the composition of a specimen 
of the doleryte (diabase as he names it) from Jersey City. When 
the mixture reached the specific gravity 3, the magnetite and 
augite of the finely pulverized rock, and some mixed grains, had 
sunk to the bottom, and only feldspar, as the microscope 
showed, remained at the top; and when diminished toa eae 
as to plainly show that two minerals were present.’ 
analyses of these parts by Dr. A. B. Howe, the two yielded: 
Sid. ah Fe.0, MgO CaO Na.O K,0 20 
1. Over 2°69__.. 52°84 62 1°52 0-46 11°81 2°38 0°86 1:06 = 99% 
2. Under 2°69 __ 60°54 “ie 11 114 0°97 915 4:11 1:06 059 =100°97 
After citing these analyses the author remarks: “ It is hare 
a that the feldspathic element in this rock is not any single 
feldspar. One of the feldspars is very plainly labradorite, and 
the other has the ratio of andesite. The two feldspars were dis- 
tinguishable under the microscope, and the optical properties of | 
* Dr. De Laski’s statement of the height (4,385 feet) at which he found nich 
" yn up toward the ‘ Horseback’ ridge” (this Journal, III, iii, p. 27), and whic 
back” ridge, at a point directly up from the head of the East Slide—- ee 
Laski’s route—is 4,109 feet. It was below this point, that De Laski found 
“upper fossils.’ 
