PEROXYLAMINESULPHONA PES LND HYDR0XYLA.MINETRI8ULPH0NATES. :;] 



mine total water, recorded above, the residue was always acid in 

 consequence of unavoidable hydrolysis and fixation ofsomeofthe 

 water of crystallisation. A discussion of this matter is eriven on 

 page 8. 



Analysis of the Sodium Salt. — Two distinct preparations of the 

 sodium salt were analysed : 



T. 0*4910 g. substance gave 0*2801 g. sodium sulphate; 



0*3845 g. gave 0*7174 g. barium sulphate, alter hydrolysis at 



200' for 3 hours. Hydrolysed at only 160° for 5 hours, 0*45 18 g. 



gave 0*8378 g. barium sulphate, = sulphur 25*30 per cent. 



only. 



II. 0*6097 g. substance gave 0*3455 g. sodium sulphate ; 



0*1750 g. gave 0*3268 g. barium sulphate, after hydrolysis at 



210° for 3 hours ; 0*7533 g. gave 24*0 c.c. moist nitrogen at 



7G0*8 mm. and 17°, = 0*0279 £. nitrogen. 



Sodium. Sulphur. Xitrogen. 



Found, I., 18-50 25*64 



II., 18*36 25*67 3*70 



Na 3 S 3 lSrO 10 , 2H 2 0, 18*42 25*62 3*76 



Crystallography of Sodium Hydroxylaminetrisulphonate. — Professor 

 Jimbö has kindly given me the following description of the crystals 

 of this salt, which were examined under his directions by Mr. Y. 

 Otsuki, University Post-graduate. Thick, tabular, monoclinic 

 crystals, about 3 mm. long and 2 mm. wide, elongated in the 

 direction of the vertical axis. The observed faces are of seven kinds, 

 of which b is the largest and apparently the plane of symmetry. ?//, 

 making with b an angle of about 115°, may be taken as a prism ; d, e, 

 and/ as pyramids; cas the base, and <j as a positive ort'nodome. 

 Two other faces in the zone of the orthodiasronal are sometimes 

 observed. A crystal laid flat on the clinopinacoid shows an 



