374 E.. Hitchcock on the Metamorphism of 
In 1860 my son brought the subject again before the Associa- 
tion for Adv. of Sci. But it was not until after that time that 
the last link in the argument was supplied by a visit to a locality 
in Plymouth, Vt., which was also discovered by A. D. Hager. 
We will now try ‘to state the facts and conclusions as they have 
been gradually worked out by us. If any should wish to verify 
our statements and see the force of our reasoning, we advise them 
to visit the different localities in the order in which we describe 
them. For the ee began at Newport, seem to be carried 
to the conclusion in Ver 
Perhaps the best iepcuehs ‘of the Rhode Island conglomerate © 
is at the well known ‘Purgatory,’ two and a half miles east of 
es and within the limits of Middletown. According to the 
paper of C. H. Hitchcock read before the Am. Association in 
Aug., 1360, the belt of conglomerate commences a little south of 
Purgatory, is a mile wide with interstratified belts of slates, and 
extends N. 30° E. probably as far as Sandy Point, in Portsmouth 
some 54 miles. It shows several folds, is underlaid othe a gritty 
schist or sandstone, and itself underlies ‘the coal m 
“It is a coarse conglomerate, composed of e aidaeetit sae 4 ened 
bles, from the smallest size, to bowlders nearly 12 feet long, cemented 
eagre amount of talcose schist, or sandstone,” with numerous 
small Tasctsteated crystals of magnetite. The pebbles are mostly a fine- 
grained, or compact quartz rock, which when partly decomposed appears 
like sandstone ; not unfrequently the pebbles seem to pass into an imper- 
fect mica schist, and show lamination. A few them are gneiss, and 
probably granite, and occasionally hornblende pte In their shortest 
diameter they rarely exceed a foot, while in seer ones two, and - 
feet are very common, and a few may be seen from 4 to 6, and one 
least, is as long as 12 feet. The following facts as to the pebbles, are of 
the most interest : 
1, They are often very much elongated in the direction of the 
strike ; 2. y The are flattened, but not so strikingly as they are 
elo ngated ; 3. Paar: , indented often deeply by one being pres- 
sed into another ; 4. They are sometimes a good deal bent, occa- 
pigs in two directions ; 5. They are cut across by parallel joints: 
ssures, varying in distance from each other from one or two 
Sishien to many feet. The most distinct of these joints, which are 
a rod or two apart; are ie pee to the horizon, and nearly 
at right angles to the st ttike, and make a clean cut from top to bot- 
tom of hills 80 or 40 feet high. Abrading agencies have often re- 
moved the rock on one side of these joints, or between two of 
them, so as to leave walls of pebbles Pecomly cut in two; the 
whole appearing like ne pile of wood neatly sawed. Acres of 
ah Nie may be seen in the vicini Often 
