83 DR. EDWARD SCHUNCK ON SOME 



same manner. The body C may^ indeed, be considered as 

 the anhydride of D, the resemblance between the two 

 substances, as regards their appearance and properties, 

 being so great that it is only by their behaviour to caustic 

 alkalies that they can be distinguished. 



E. 



Of this body I only obtained a quantity sufficient for two 

 analyses, and I must, therefore, leave it doubtful whether 

 its composition is uniform or not. 



I. 0-4355 grm. gave i'io5o grm. carbonic acid and 

 0-1770 grm. water. 



0*5995 grm, gave 0-5740 grm. chloride of platinum and 

 ammonium. 



II. 0-4685 grm. gave 1-1890 grm. carbonic acid and 

 0-1930 grm. water. 



0-5615 grm. gave 0-5560 grm. chloride of platinum and 

 ammonium. 



These numbers lead to the formula Cj,g HijNOg, which 



requires 



^1 , ,. Experiment. 



Calculation. j ^ jj 



C„5 168 69-70 69-20 69*21 



h'h II 4'56 4-51 4-57 



N 14 5"8o 6'oi 6"2i 



Og 48 19-94 20-28 20-OI 



241 loo-Qo roo'co loo'co 



If this formula be correct, it follows that 2 ats. of indigo- 

 blue combine with i at. of alcohol and 5 ats. of acetic acid 

 in order to form, after elimination of 14 ats. of water, 2 ats. 

 of the body E, since 



Indigo-blue. Alcohol. Acetic acid, 



a(C,3 Hi, N03)+ i4H0=2(C,g H, NO,)+C, H^ 0,+ 5(0, H, OJ. 



On comparing the formula of E with that of C, it will 

 be seen that the former merely differs from the latter by 

 2 ats, oxygen, so that C + 20 = E. 



