1824.] Mr'. Children's Examination of Babinglonite. 277 



the primitive form being a doubly oblique prism. I have 

 thought it would not be useless to place here the discussion of 

 the observations which misrht lead to assume another form as 

 the primitive, on account of the ambiguous characters of this 

 remarkable form. The incidences of the planes of fig. 2 are as 

 follow : 



(p, ■»)= 92 : 34' </>, /) = 88° (/«,n = 112° 3(f(m, h>) = 137° .7 

 (/, *') = 155° 25' {p, d ) = 150° 25' (g« m) = 132° 15'. 



These crystals scratch glass easily. This substance I propose 

 to call Babinglonite, in honour of the late President, and one of 

 the founders of the Geological Society of London. His claims 

 to have his name thus recorded in mineralogy, are too manv, and 

 too well known to every well-wisher of this science, to require 

 any comment by me. 



In Mr. Turner's catalogue, I had gfiven the same name to a 

 substance from Freyberg ; but I find that Mr. W. Phillips, in 

 his last work on Mineralogy, has noticed the same substance, 

 and designated it under the name of sulphuret of silver and anti- 

 mony, which name there is not the least ground to change. 



Mr. Children has kindly undertaken to examine with the 

 blowpipe a small quantity of babingtonite. 



Article VII. 



Examination of Babingtonile by the Bloup> 

 By J. G. Children, Esq. FRS. &C; 



(To the Editor of the Annals of' Philosophy.) 



DEAR SIR, March 14, 1824. 



In glau mairmu, the Babin^tonite decrepitates very slightly, 

 and gives off a dense vapour, which soon disappears. A thm 

 film of pure water condensed on the sides of the tube. Appear 

 ance of the assay not altered. 



Alone, in forceps, fuses on the surface, pretty readily, into a 

 black enamel. 



With soda, on platina wire, in the oiidatinz fame, the assay 

 gives a dark-cjreen opaque globule ; the addition of nitre height- 

 eni the colour. 



In the reducing fame, the colour chanses to dark-brown, or 

 nearlv black ; globule opaque. 



With borax. P. W. In O. F. deep amethyst-coloured 2lu- 

 bule ; in R. F. colour changes to bluish-green ; globule perfectly 

 transparent in both flames. 



With salt of phosphorus. P. W. In O. F. scarcely any action 



