Temperature of Sublimation. 3 



As nothing has been said in the first paper as to the 

 characters and recognition of the sublimate of As 2 3 , a word 

 on the subject may be useful here. The sublimate is always 

 very nebulous and diffusive in character ; never pure white, 

 but greyish ; or even brownish if the oxidation is imperfect. 

 It begins as a mere dulling of the glass. Seen under 

 the microscope it may show perfect, colourless octahedra, 

 especially on the lower glass, if slowly formed ; or it may 

 appear as a formless dust. From the latter, crystals may be 

 obtained bv reheating the sublimate between the glasses. 

 The smell of garlic is rarely obtained under the conditions. 

 When tested for odour there is a faint earthy smell. It is 

 less easily volatilized off the glass than sulphur. It is im- 

 perfectly soluble in cold HC1 ; more readily soluble in warm 

 HC1, and easily soluble in hot water. The solution in hot 

 water may be tested readily by any of the usual chemical tests. 



The following results are additional to those already 

 published : — 



Table II. 



III. EAs ; EAsS ; R,As 3 ; R 3 As 4 ; EAs,. 



1. Glaucodote. (CoFe)AsS. Tunaberg 480 



2. „ „ Loc? 480 



3. Gersdorfite. (NiCoFe) 3 (AsS) 4 . Miisen 450 



4. „ „ Loc? 480 



5. Breithauptite. NiSb with tr. of As. Loc? 520 



6. Tennantite. 1] CuS, FeS, 5 CuAsS. Cornwall 500 



7. Ullmannite. MS 2 , Ni(SbAs) 2 [? No Lobenstein 530 



Sb detected]. 



8. Alloclasite. Co(AsBi)S. Loc? 480 



9. Domykite. Cu 3 As. Paracatas 370 



10. „ ., Loc? 365 



11. Algodonite. Ou e As. Mohawk Mine 350 



12. Whitneyite. CiigAs. Houghton Co 395 



II. ES, As 2 S 3 ; As 2 S ; , ; EAs ;! ; EAs 2 S.. 



13. Enargite. 3 Cu 2 S, As 2 S_. Red Mt., Colorado ... 290 



14. „ „ Loc? 290 



15. Allemontite. SbAs 3 . Allemont 250 



16. „ „ „ 200 



17 & 7. Ullmannite. Considerable subl. of As.,0., at 285 



I. As ; AsS ; loosely attached As. 



18. G-eocrinite. Sala, tr. of As 2 3 at 150 



19, 17 & 7. Ullmannite. „ „ „ [85 



20 & 2. Glaucodite. , L90 



B2 



