18^ Meply to a Note in the Annates de Chimie. 
a hot iron, and directing my attention to the part without veinSy 
I find that the phosphorescent matter is arranged in strata or 
•veins ^ (although no veins are seen), and upon looking to the 
part with veins, I observe, that the veins rendered visible by 
phosphorescence are parallel to the veins visible to the eye. 
In this experiment, I pay no attention to the phosphorescence 
of the veins visible to the eye ; but I remark, that each stra- 
tum (not the strata visible to the eye, but the strata render^ 
ed visible by phosphorescence ) emits a phosphoric light pecu- 
liar to itself. If any ground for misconception existed, it was 
entirely removed, by comparing the effect now described to that 
produced in a piece of chalky Tabasheer, of an uniform 
whiteness^ where a veined structure is exhibited, cfter the par- 
tial discharge of the oil which it had unequally absorbed.'^"' Will 
the reader believe, that these three lines, though containing a 
curious fact, and highly illustrative of the subject under dis- 
cussion, are not only omitted in M. Arago’s translation of my 
paper, but are the only lines in it that are omitted ^ ? 
If the object of my notice had been to communicate the fact, 
that a veined structure gave a veined phosphorescence, it would 
have been entirely inconsistent with the title of it, which express- 
ly states, that it is upon a Singular Developement of Crys- 
talline Structure by Phosphorescence ; and when I found a vein- 
ed structure thus luminously displayed, where the eye could 
not discern it, I had recourse to~a microscope, and even then 
I found that the phosphorescence exhibited veins which could 
not be detected by the application of that instrument. 
But let us suppose that my notice had nothing to do with the 
developement of crystalline structure, where it was not otherwise 
apparent, and let us suppose that it was only, like that of Pallas, 
a simple experiment on veined fluor-spar. Even in this point 
of view, it contains a new result. Pallas observed in a piece of 
violet spar, with green veins, that the green veins were phospho- 
* That these lines were intentionally omitted, is very obvious ; for in the pa- 
ragraph which precedes the translation of my notice, the Editor says, “ En void 
la substance.'*'* But instead of tllb substance, he has given the whole notice, except- 
ing the three lines on tabasheer ! The Editor had perhaps some good reason for 
}c<'e])ing the word Tabasheer out of the Annales de Chimie. 
