174 Miscellanies. 
Admitting 0.11 atoms of magnesia, and 0.04 atoms of protox. iron, 
to be in combination with alumina, and only accidental, and 0.16 of 
water, to be mechanically lodged in the mineral, then it will be a bi- 
hydrous tersilicate of magnesia; and is therefore the magnesite of 
Dr. Thomson’s Mineralogy, Vol. I. p. 178. 
Another mineral was sent to Dr. Tomson, under the name of 
Deweylite, by Dr. Holmes, concerning whose locality nothing is 
recollected, and which consists of 
ilica, 41.42 
Magnesia, 23.53 
Soda, pete ’ ‘ 6.25 
Alumina, . , wiciigeng 4.47 
Oxide of cerium, . ‘ . 3.57 
Protox. of iron, : ‘ . a trace. 
Water, ‘ ‘ 9.86... _.+ 
It is a triple, if not a quadruple salt. 
10. Ornithichnites in Connecticut.—Extract of a letter from 
Prof. E. Hitchcock, dated June 28th, 1836.—In my account of 
the Ornithichnites in New Red Standstone, given in the last Jan- 
uary number of the Journal, I intimated that perhaps they might 
be found at a place called the Cove, in Wethersfield, Ct. I went 
to Hartford last year mostly to visit this spot; but having been there 
informed that no rocks existed at the Cove, I did not go there. Yet 
recently a young gentleman of the Junior Class in Amherst Col- 
lege, whose father resides near the spot, and who had carefully ex- 
amined my specimens of Ornithichnites, informs me that he has dis- 
covered them at the Cove in considerable abundance and variety- 
Bat I will give you an account of them in his own words. 
ioe The first specimen I examined was a step stone which had been 
muse nearly a century ; on which were four steps, whose length 
was 14 or 15 inches, and the length of the foot 4 or 5 inches. The 
middle toe has three tuberous swellings, the outer ones two. The 
claws are all of considerable length. ‘This resembles your O. tube- 
rosus, « dubius. Upon another door step in the same vicinity, I 
found two rows of tracks, the feet having the same direction. The 
length of these steps is 29 inches, and of the foot 7 inches, swell- 
ings and claws on the toes. ; 
At the Rocky Hill quarry, in Hartford, I found a specimen close- 
ly resembling that just described: the length of the foot 6 or7 
inches, and of the step 27 inches—I found there but two tracks. 
