in regard to Discoveries in Crijsidlhgrdphy. mt 
of residence.” You will remember that at that time I was 'in 
England. 
Some time after my return to Germany I became acquainted 
with the existence of that paper, more particularly by M. Ilaus- 
marm’s work, “ Inquiries into the Forms of Inorganic Nature F 
This excited in me a desire of perusing it. It was not to be 
found in the library of the Academy of Freyberg. M. Breit- 
liaupt , some time ago, had promised to send me it ; this pro- 
mise was fulfilled on the 24th December 1822, after I had 
again put him in mind of it, on the occasion of what Professor 
Weiss calls his claims to my systems of crystallisation. 
If you examine this paper, you will remark that it agrees 
very closely with what is contained in the second edition of my 
Characteristic, respecting the kind of the forms within the diffe- 
rent systems : an agreement which you will find still greater, if 
you compare it with the first volume of the Treatise on Mine- 
ralogy, which I have lately published, and of which M. Hai- 
dinger is preparing an English translation. In this treatise, the 
description of the forms of the tessular system are very often 
expressed, almost with the same words as those of Professor 
Weiss. This coincidence, so far as it goes, is remarkable 
enough ; and, in order to account for it, I shall proceed with my 
historical statements. 
Things being, at the end of 1814, in the condition which I 
have mentioned above, I considered the composing of an ele- 
mentary work on mineralogy, as an undertaking both useful 
and necessary. I directed my attention, in consequence, to the 
construction of such a work, and, before the end of 1816, the 
manuscript was completed. Of this work, the paper which you 
afterwards inserted into your Journal, but which was written 
in the same year, must be considered as a short extract; the 
only intention of which was, to give yourself a precursory gene- 
ral idea of my method. 
The manuscript having thus been completed, and answering 
entirely to the then existing knowledge of mineral productions, 
I had determined to publish it immediately ; but in this I was 
prevented by my journey to England. On this journey, when 
I left Freyberg, the 3d December 1817, I carried the said manu- 
script along with me, in order to give you a more extensive view 
