454 Mr. A. H. Church on some Derivatives of Xylole. 



solution to which bichloride of platinum had been added, had 

 deposited a crop of crystals (I.). 



This first crop of crystals consisted of slender needles. 



I. -7225 grm. gave -2088 grm. platinum : — 



Per cent, platinum. Theory (cumidine). 



28-89 28-92 



The second crop, of needles similar to the first crop. 



II. -5502 grm. gave -16 grm. platinum : — 



Per cent, platinum. Theory (cumidine). 



29-08 28-92 



The third crop, stellar groups of short yellow needles. 



III. -325 grm. gave -098 grm. platinum : — 



Per cent, platinum. Theory (xylidine). 



30-15 3016 



The fourth crop, similar to the third. 



IV. -3254 grm. gave -099 grm. platinum : — 



Per cent, platinum. Theory (xylidine). 



30-39 3016 



The fifth and sixth crops, of short, flattened, orange prisms, gave 

 respectively 30'2 and 30-33 per cent, of platinum. The seventh 

 crop, fine golden-yellow scales. 



VII. -2015 grm. gave -0632 grm. platinum : — 



Per cent, platinum. Theory (toluidine). 



31-36 31-51 



Preliminary examinations with small quantities of a solution 

 similar to that from which were obtained the crops of crystals 

 described above, gave me some idea as to the proper time for 

 the separation of each successive crop. Crops I. and II. (cumi- 

 dine platinum salt) weighed together less than 2 grms., while 

 the united weight of crops III., IV., V., and VI. (xylidine pla- 

 tinum salt) was not less than 25 grms. Of crop VII. not more 

 than -3 of a gramme was obtained. 



22 grms. of xylidine platinum salt were introduced into a 

 Florence flask with an excess of caustic soda, the neck of the 

 flask being bent and connected with a condenser. By distilla- 

 tion a large quantity of a nearly colourless oil was obtained in 

 the receiver. This oil was xylidine, C 16 H 11 N. 



Xylidine rapidly attracts oxygen from the air, acquiring a 

 reddish-violet colour and gradually resinifying. It turns dahlia 

 paper green, and slightly restores to reddened litmus paper its 

 original blue tint ; the oxalate and sulphate, which were the 



