120 Miiieralogical Notices from Foreign Journals. 



The liquor from which this new acid is precipitated con- 

 tains abundance of acetic acid formed at the same time. The 

 reaction may be easily explained as follows : 



1 atom of oleic acid C^4 H.:,g Oj"\ p „ ^ 



and 8 atoms of water ... H^' O^j^^ "^' ^^^' 



may produce 



1 atom of the new acid C30 Hgg O3"] 



3 atoms of acetic acid Cjo Hg Og ^C44H47 0,3; 

 and 8 atoms of hydrogen Hg J 



or from elaidic acid 



1 atom of elaidic acid C-o Hgg O5 



7 atoms of water . . . H^ O7 



may produce 



2 atoms of the new acid 



2 atoms of acetic acid 

 and 7 atoms of hydrogen . . 



^72 "73 

 Some traces of carbonic and oxalic acids which appear are 



not here introduced. 



The production of elaidic acid from oleic acid cannot as 

 yet be explained. There are also other products, particularly 

 one, a red or orange-coloured liquid, the formation of which 

 is the cause of the citrine tinge in ordinary elaidine. This 

 substance could not be got in a state fit for analysis. 



XXII. Miner alogical Notices fj-om Foreign Journals*. 



ANTIGORITE. BY MM. WISER AND SCHWEIZER. 

 [From Poggendorff's Jnnalen, vol. xlix. Part 4.] 

 npHE characters assigned by M. Wiser to this mineral are 

 -*- as follows; — not crystalline; hardness = 2*5 (scratches 

 gj'psum, is scratched by calcspar) ; specific gravity 2*622, 

 slightly lustrous ; in thin plates semi-transparent ; in very 

 thin leaves transparent: colour by reflected light blackish 

 green; by transmitted light leek -green ; it does not affect 

 the magnetic needle. Two analyses by M. Schweizer gave 



Silica 46-22 46-18 



Protoxide of iron 13-05 12-68 



Alumina 2-08 1-89 



Magnesia 34-39 35-19 



Water 3-70 _~_ 



99-44 99-64 



• Communicated by Mr. W. Francis. 



