Telescopes—Life of Fraunhofer. ° 303 
I hope to see a specimen of Lerebours’ telescopes, as a 
person belonging to Salem, has, by my advice, sent out for 
one that will cost two hundred dollars ; this is the price of a 
small instrument, but still it will show the skill of the artist. 
An eminent philosopher in Great Britain, in a letter to m 
remarks, that the continental achromatic telescopes surpass 
them all; [the different telescopes lately made in England, ] 
and he rebukes the negligence of the British government. 
I wrote to Europe, with the special view of obtaining infor- 
mation which might be useful to all our scientific institutions. 
But it was so long before it arrived, that I do not wonder 
your college should have engaged an English artist; although 
am now sorry for it. You have, sir, no doubt, read the 
beautiful memoir of the life of Fraunhofer, published in 
Brewster’s Journal, 1827, page 1. How feelingly the wri- 
ter expresses himself on the death of this truly great and 
ng artist and philosopher, and how indignant he seems 
to be at the neglect of the English government to Dollond, 
the iat of the achromatic telescope. 
ermit me sir, to inquire of you, if you ints repeated the 
experiments of the French chemists on the making of dia- 
onds?* It is a very remarkable circumstance that the dia- 
mond, should unite a very high refractive with a low lisper- 
sive power. I do not recollect any other instance of it. 
Rapport du Jury Central Exposition, 1823. 
M. Lerebours, ser a Paris, place du Pont-Neuf, qui 
recut en 1819 une médaille d’or, a exposé plusieurs instru- 
ments d’optique en sont tous trés digits de la réputation 
dont i] jouit dans le monde savant. Deux de ses lunettes, 
dont une a neuf pouces et demi d’ouverture, ont fixé l’at- 
tention du jury. Rien de a n’est certainement 
sorti des ateliers d’aucun optic 
Le jury décerne une nouvelle mmiéctaille d’or a M. Lerebours. 
* The materials mentioned 28 eed 2 acinadt Soni namely, ri a “4 
carbon and phosphorus, were the facts w 
nounced, in February, as r requ 
the result, it cannot be ex xpected ears th It is Said that the phosphorus oper- 
ates by detaching the sulphur from the sulphuret of carbon, and that thus the 
carbon is gradually Se to ee so as to uce diamond, in small 
this n n 
puted 1 in some of the most vedi of the French chem 
