Reply to a Note in the Annales de Chimie. 181 
TCemet aucune lueur sensible^ et quelquefois n’est point phospho- 
rique de tout.” 
The preceding passage, which we have printed, literatim as it 
stands in the original, evidently contains two charges, the one 
expressed, and the other implied. The expressed charge is, 
that I have very strangely omitted to quote Pallas’s experi- 
ments on phosphorescence; and the implied one is, that Pal- 
las’s paper contains the same discovery which I have announ- 
ced in my notice On a Singulfi>T JQ^evelppement of Crystalline 
Structure by Phosphorescence, 
The first charge is unworthy of notice"; as an author is en- 
titled to give, as he pleases, either a short or a copious history 
of the subject of which he treats. The experiments of many 
other philosophers are Omitted, as well as those of Pallafe ; and 
the blame of omitting his name, must be shared with Mr Wedg- 
wood, Haiiy, and every other writer on the subject that I ani 
acquainted with, 
Thp other charge, which was intended to be a more serious 
one, is founded on an utter misconception of the result announ- 
ced in my notice, arising, it is to be hoped, from an imperfect 
acquaintance with the English language. 
The result obtained by Pallas may be thus expressed : .In 
the fluors of Ouboukoun, &c. which have green veins on a violet 
ground, the green veins are phosphorescent with a moderate 
beat, and the violet part is opaque.” Now, it was known 
to all the world, that green fluor gave out a green light, 
and blue fluor sometimes a differently coloured light; and 
every child who has amused himself with heating some of 
the Derbyshire spars, which are generally blue and green, 
could not fail to notice, that the green gave out one light, and 
the blue a diflerent light, or perhaps none at all. This fact I 
have observed repeatedly ; and if I had published it as a new 
discovery, I might have been justly reminded, in the usual lan- 
guage of civility, by those who had a tender regard for Pallas’s 
reputation, that he had anticipated m^ in this fact. 
The result, however, contained in my paper, is very different 
from this. I take a piece of fluor-spar, which has perceptible veins 
in one part, and no appearance of them in another : I place it on 
