356 On the Discovery of Fluoric Acid in the Condrodite. 
this active agent, even when largely diluted, it is necessary 
be very much on our guard, lest the corrosion go too far, 
and attack the plain parts of the glass. 
In this manner, the rich and beautiful picture, represent- 
ing the Oto Council, as delineated in the atlas, illustrating 
the narrative of Major Long’s expedition, was elegantly 
etched in two minutes. ; 
We have, for a course of years, tried many experiments 
upon the etching of glass, by the fluoric acid vapor, an 
have usually succeeded more or less perfectly ; but-we can 
confidently recommend the pure diluted acid, as being en- 
tirely superior, in energy, neatness, and ease of manage- 
ment. Although the strong acid is viclent and dangerous, 
in the extreme, and should be by no means allowed to touc 
the skin, either in the fluid or vaporous state, the diluted 
acid may be managed with ease and safety. Still, a pupil, 
who incautiously dropped some of the latter upon his hand, 
experienced inconvenience for six weeks—that period hav- 
ing elapsed before the sore was healed. 
It is proper to remark, that whenever the acid was pour- 
ed from the receiver, the latter was firmly grasped by tongs 
of a peculiar construction, in order to avoid the danger of 
having the liquid come in contact with the hand. 
INTELLIGENCE AND MISCELLANIES. 
———— 
I. Domestic. 
1. Vindication of Mr. Henry Seybert’s claim to the dis- 
covery of fluoric acid in the condrodite, (Maclureite of Mr. 
Seybert, yellow mineral of Sparta, N. J.) 
Philadelphia, Feb. 25, 1823: 
Sir, 
But for some erroneous statements in Mr.Nuttall’s reply 
to my letter of the 11th November, 1822,* our Controver- 
sy might have terminated. I feel it, however, a duty to 
*See Journal of Science and Arts, Vol. VI. p. 168, & seq- 
