Mineral found at Stromness in Orhney. 381 
By careful analysis, two parts yielded, 
Carbonate of Strontites, 68.6 
Sulphate of Barytes, . S7.5 
Carbonate of Lime, ^.6 
Oxide of Iron, 0.1 
98.8 
Loss, ......1.^ 
100.0 
This mineral, on repeated trials, appeared so uniform in its 
composition, as to deserve being considered a new species, for 
which the name Barystrontianite^ or Stromnite, is proposed. 
Its geological situation is in veins, or rather in nests, accom- 
panied by galena, in the above mentioned rocks, which may 
perhaps belong to a grey-wacke formation. This rock appears 
to rest on mica-slate, which is in connection with gneiss and 
small grained granite of a grey colour. 
I may add, that a recent attempt to procure fresh specimens 
of this mineral has been unsuccessful, and a friend, who visited 
the spot, was only able to find masses of common sulphate of 
barytes, which I previously knew to be abundant in that neigh- 
bourhood. 
Liverpool, July 31. 1819. 
Art. XXVIII. — Account (fa singularly Poisonous Insect 
which destroys Horses. By the Beverend Elias Corne- 
lius 
In the Choctaw Country, 130 miles N. E. of Natchez^, a part 
of the public road is rendered famous by the periodical return 
of a poisonous and destructive fiy. Contrary to the custom of 
other insects, it always appears when the cold weather commences 
in December, and as invariably disappears on the approach of 
warm weather, about the 1st of April. It is said to have been 
* This article is extracted from Mr Cornelius’s account of the Geology, &c, of 
Tenessee, &c., published in the American Journal of Sdenccy No. iv. p. 328, 
VOL. 1. NO. %. OCTOBER 1819= C C 
