12 



U. SUZUKI. 



to a small volume. The solution gave the following reac- 

 tions : — 



W ith phospho-tungstic acid Voluminous white precipi- 

 tate. 



,. phospho-molybdic acid Yellow precipitate, solu- 

 ble in excess. 



,, potassio-mercury 



iodide Xo precipitate, on addition 



of much caustic soda, 

 white precipitate was 

 formed. 



,, potassio-bismuth 



iodide Red precipitate. 



The solution was further concentrated and after several 

 days standing over sulphuric acid, fine white prismatic crystals, 

 were obtained, which agree perfectly well with E. Schulze's 

 description of arginin nitrate. A solution of these arginin 

 nitrate crystals was mixed with some copper hydrate, and on 

 being warmed a portion of the copper hydrate was dissolved 

 with a dark blue colour. The solution was filtered while hot, 

 and the filtrate was evaporated to a small volume and let stand 

 over sulphuric acid. After three or four days, dark blue 

 prismatic crystals were obtained, which after careful washing, 

 were dried over sulphuric acid and analyzed. 



0.1075 g. crystals became on drying at ioo°C. 0.0975 g. 



= 9-3/0 water of crystallization. 

 0.1075 g. crystals yielded 0.016 g. CuO = o.oi26 g. Cu 



Calculated as (C c H u N 4 0 2 ) 2 Cu(N0 3 >, 3H0O 



9.13% water of crystallization. 



• 10.75^ Cu. 



A somewhat higher percentage of copper in my preparation 



(1) For the determination of copper the crystals were first ignited and weighed. 

 The CuO thus obtained was dissolved in sulphuric acid and precipitated with a dilute 

 soda solution. The copper hydrate precipitate was collected on a filter, washed very 

 well, dried, ignited and weighed. Xo difference was observed between the two 

 weighings. 



