48 Mr Haidinger on Botryogene, 



obliged to curtail my remarks, and to suppress many facts 

 to bring them within the limits of one paper ; but I believe 

 this account will be found more comprehensive and accurate 

 than any I am acquainted with in our own language. I have 

 departed very much from the essay of Nibby, which I at first 

 proposed to myself as a rigid guide, in order to amend his ar- 

 rangement, which shows little knowledge of mineralogy, and 

 to add various more general and physical remarks than he, as 

 an antiquary, thought it necessary to do. Besides, that, for ob- 

 vious reasons, I was desirous not to follow him too closely, al- 

 though I only profess myself a follower and humble imitator 

 of his work : I have embodied almost all the facts he mentions, 

 in the preceding pages, but the original contains some antiqua- 

 rian researches I have omitted, and much valuable classical 

 authority, which renders it well worthy of a careful perusal, 

 and I beg to recommend it strongly to your readers. 



I am, Sir, your most obedient servant, A 



April 29, 1828. 



Art. IV. — On Botryogene, the native Red Iron-Vitriol of Falu 

 lun. By William Haidinger, Esq. F. R.S.Ed. Com- 

 municated by the Author. 



A description of a red salt of iron was some time ago given 

 by Berzelius, and published along with an analysis of it, from 

 which it appeared that the substance was deserving of a place 

 in our mineralogical systems. Very little, however, could be 

 then made out of its physical properties. Through the kind- 

 ness of Professor Berzelius in Stockholm, and Mr Pohlheimer 

 in Fahlun, I have been furnished with specimens of this in- 

 teresting substance, and thereby enabled to supply the defi- 

 ciency of the former accounts of it. To the description I pro- 

 pose to add an abstract of the paper by Berzelius, * which 

 has never been published in any English journal. 



" Analys af ett fossilt salt fran Fahlu gruf'ra, och In?jo sankning, af J. 

 G. Gahn och J. Berzelius. Afhandlingar i Fysik, Kemi och Mineralogi, 

 iv. p. 307. 



