Mineralogy— ■* Botany. 365 



gy, with the history and literature of the sciences in systematical arrange- 

 ment. In reference to the crystallography, Dr Hartmann pursues the me- 

 thods of Prof. Mohs and of Prof. Weiss. This work merits the .particular 

 notice of all mineralogists, and also travellers, because the size of the 

 book is not great, and the type very small. A German, an English, a 

 French, and an Italian index facilitate the use of the book, and 312 fi- 

 gures illustrate the forms of the crystals. 



3. Dr Hartmann has also published Vorlesungen uher Mineralogie, &c, 

 Lectures on Mineralogy, particularly for Schools, &c. Ilmenau, by Voigt, 

 8vo. This elementary treatise is strongly recommended to young men 

 who study the natural history of minerals, and to lecturers in schools. As 

 in the elementary introduction of Mr Phillips, the crystalline forms of mi- 

 nerals are illustrated with wood-cuts printed along with the text. 



27. Chloropheite discovered in Northumberland. — Mr William Hutton 

 of Newcastle-upon-Tyne has discovered that rare and curious mineral 

 called chloropheite, in a basaltic dike near Coquet Water in Northumber- 

 land, about two miles north-east of Felton. It exists in the form of small 

 nodules, which, from a specimen kindly sent to us by W. C. Trevelyan, 

 Esq. has exactly the same appearance and properties as those of the chlo- 

 ropheite which Major Paterson brought from Faro. Mr Hutton has also 

 observed the same substance at Coaley Hill near Newcastle, but in the 

 earthy form. 



28. Two New Minerals consisting of Biseleniuret of Zinc and Sulphu* 

 ret of Mercury. — These new minerals were found at Culebras, in Mexico, 

 by Mr J. M. Herrera, in the limestone which overlies the red sandstone. 



The red mineral burns with a beautiful violet coloured flame. Its spe- 

 cific gravity is 5.66. It is a biseleniuret of zinc, but the mercury will be 

 in the state of a bisulphuret. Its formula is Zra Se 4 -f-Hg- S 2 . 



The gray mineral is like light gray silver ore, but yields a blacker pow- 

 der. Its specific gravity is 5.56. It is composed of 



Selenium, - 49 



Zinc, 24 



Mercury, - - 19 



Sulphur, - - 1.5 



93.5 

 which, with the addition of six grains of lime obtained, will amount to 

 99.5. The lime, however, is mechanically mixed with it. Hence the 

 mineral is a biseleniuret of zinc united to a protosulphuret of mercury, 

 and its formula is Zn Se*+HgS.—Phil. Mag. Aug. 1828, p. 113. 



BOTANY. 



29. Flora Danica. — In the course of last summer (1827) Professor 

 Hornemann of Copenhagen published the thirty-second Fasciculus of Flora 



VOL. IX. NO. II. OCTOBER 1828. a a 



