în'DROXYLAMrXl>«,9-DISrLriTONATi:S. 7 



soluble in water us the corresponding (but hydrated) ;9^?-salt. ( )f 

 it 6.44 parts at 16.4°, 7. IS ])arts at 17.8°, and 8.0Ô parts at 20° 

 dissolve in 100 parts of water. Its solution is neutral to litmus, 

 to methyl-orange, and to Phenolphthalein. 



The salt forms h;ird monoclinie prisms which are sometimes 

 short thick prisms, sometimes flattened tables, and sometimes long 

 slender prisms or needles. Crystals of the one or other habit generally 

 recrystallise in that habit but the salt is not dimorphous. A saturated 

 solution of one form of the salt is saturated also towards another 

 form of it, whilst the two forms will lie side by side unchanged 

 for a length of time in the same mother-liquor. Prof. Jimbö 

 has kindly supplied the following account of his examination 

 of a short thick prism : — A monoclinie crystal, developed per- 

 fectly on one end of the clinodiagonal, about 6 mm. long, was 

 measured by means of a contact goniometer, only two angles, c 

 e and e d, having been measured by reflection. The faces a and 

 g were depressed ; the other faces also did not give good 

 images. Seven faces were recognised ; one other could not be 

 determined. 



= 133°25' 



= 144°27' 



= 127°o3' 



. 141°25' 



= 126°15' 



: 117^ 



The results of analyses, of (A) the tabular form and of (B) 

 the acicular form of the salt, are as follows : 

 A. .2863 gave .1845 potassium sulphate. Potassium = 28.98 

 .2100 gave .3673 barium sulphate. Sulphur = 23.96 



