91 
I shall give up the little government steamer I have had 
for the last two months, divide up my party, and go over the 
ground with a large canoe. ; 
I forgot to say that I found at the falls, very heavy beds 
of Red Sandstone more or less altered, much disturbed and 
broken through by numerous dykes of Prophyry and Trap, 
I have been wondering whether these beds may not turn out 
_ to be the equivalents of our Potsdam Limestone. 
I have done a large amount of work in the Amazon Clays 
and Sandstones. They are all marine formations, but I find 
no fossils. Trap is associated with them, which certainly 
does not point to a glacial origin for them. 
Please pardon this short note, I thought it might interest 
you to know that my little expedition has not so far turned 
out a failure. 
With kindest regards, &c. 
C, Frep. Harrv. 
The following paper was read, 
Alleged Discovery of the Arch among the Aboriginal Remains of 
New Mexico. 
By E. Gro. Squigr, M. A. 
On several occasions, I have taken the trouble of calling 
the attention of the Society to a series of archzological im- 
postures, that have found a place in our newspaper press— 
chiefly in the newspapers of the West, where there seems to 
be a morbid tendency in this direction. Most of them are 
too transparent to deceive any man of ordinary intelligence, 
but some are rather adroitly conceived, and have led some 
very clever students into a painful kind of semi-credence. 
At their instance, I have several times taken the pains. to 
“hunt down” the current story, and to find it “a hoax!” 
You will remember the “full and particular” account of the 
vast, subterranean temple in the Palisades; the wonderful 
excavations under Rock Island, the remarkable tunnel under 
the Mississippi river, opposite St. Louis, “the great stone 
jug in Martin County, Indiana, 80 feet high,” “the Onondaga 
