124< Mr. T. Richardson's Researches 



•3244 grm. Anhydrous amygdalme were submitted to analysis. 



27°7 Barometer at the time of experiment. 



12°6 Thermometer at the time of experiment. 



15*0 cc ... Air before commencement. 

 20°5 cc ... Gas and air after cooling. 



5*5 cc ... Azote. 



5'5 cc Azote reduced to 0° thermometer and 28° barometer 

 give 5*19 cc, equivalent to 2*0 3 per cent., which is, according 

 to Liebig, 1 per cent, less than the true quantity. 



From these experiments there appears to be a constant error 

 of 1 per cent. This error was supposed at first to arise from 

 a diminution of the oxygen in the air of the tube of combus- 

 tion, destroyed in oxidizing the carbon and hydrogen. With 

 the view to obviate this cause of failure, carbonate of copper 

 was mixed with the oxide of copper, so that before the com- 

 mencement of the decomposition of the organic body, the 

 heat expelled the carbonic acid of the CO^, Cu O, and drove 

 out all air in the tube of combustion. 



With this modification — 



•3566 grm. Amygdaline were submitted to analysis. 



27°6 Barometer. 



11°4 Thermometer. 



14 cc ... Air in the receiver before commencing. 

 on /.^ fGas and air at the close of the experiment after 

 (^ cooling. 



6 cc ... Azote. 

 6 cc Azote reduced to 0° thermometer and 28° barometer give 

 5'65cc which equals 2*01 per cent. The loss here amounts 

 again to 1 per cent. 



•2456 grm. Crystallized asparagin. 

 27°4 ... Barometer. 

 12°7 ... Thermometer. 



43 cc ... Air at the commencement in the receiver. 



81 cc ... Air and gas when finished. 



38 cc ... Azote. 

 38 cc Azote reduced to 0° thermometer and 28° barometer give 

 35*49 cc which equals 18*32 per cent. The loss here amounts 

 to '64 per cent. 



Oxide of copper having the property of absorbing carbonic 

 acid from the air, which is expelled by the heat in the tube of 

 combustion, and its place occupied by the mixture of azote 

 and air in the end of the experiment, it was supposed that 



