124 ANDREAS KURTZ 



turned his attention principally to the making 

 of colours, and especially to the production of 

 chromate of potash. It is not necessary to 

 cite his various recipes for making standard 

 solutions, still they are interesting as indicating 

 his methods of analysis. We quote just one : 

 "iofr. in silver = 80 gram silver and copper 

 with sufficient quantity nitric acid and water 

 produces 700 at 26 sp: gr: i gram metallic 

 silver will precipitate 4^ of salt. One gram 

 metallic silver gives 2% of dry nitrate of 

 silver, therefore i gram dry nitrate of silver 

 will precipitate 2 oz. of dry muriate of soda." 



There is a paper on bleaching powder, but 

 it appears to be a study rather than an 

 original work, for he heads it : " Bleaching 

 Powder, see Turner, page 447." No. i, good 

 commercial bleaching powder contains . 



Chlorine ... ... ... 23 



Lime ... ... ... 46 



Water 31 



ICO 



No. 2, made by himself, is : 



Chlorine ... ... ... 40 



Lime ... ... ... 45 



Water 14 



