266 On the Dfifinlte Proportions in which the [April, 



Hydrogen 6'S9 1 



Carbon 42704 



Oxygen 50-.105 



100-000 



Now it is evident that tliis is 21 O + 24 C + 44 H ; that is to 

 say, that it contains 1 O + 2 H more than pure sugar, and as much 

 less than the sugar which I have before analyzed ; so that this last 

 sugar contains only half the water of combination of the other. 

 As this was the last of all the experiments described in this 

 memoir; and as it was made just at the time when other circum- 

 stances obliged me to desist, 1 have not had an opportunity of re- 

 peating it. It would have been interesting to discover by what 

 accident one half of the water of combination had been removed. 



Thenard and Gay-Lussac found sugar composed of 



Hydrogen 6*90 



Carbon 42-47 



Oxygen 50-63 



100-00 



This coincides with my last analysis. 



1 1 . Su"ur of niiUi. — The sugar of milk employed in the follow- 

 ing experiments was purified by repeated crystallizations. It was 

 then reduced to powder, and dried at 212° in a vacuum. Gay- 

 Lussac and Thenard found sugar of milk composed of 



Hydrogen 'J-Ml 



Carbon 38-825 



Oxygen 53-834 



100-000 



I burnt 0-4 of sugar of milk, which produced 0*244 water, and 

 0-5805 carbonic acid. From these data sugar of milk is composed 

 Of 



Hydrogen 7' 167 



Carbon 39-4/4 



Oxygen 53-359 



100-000 



These numbers correspond almost exactly with the supposition 

 that sugar of milk is composed of one volume of oxygen, one 

 volume of carbon, and two volumes of hydrogen. According to 

 that supposition it is composed per cent, of 



Hydrogen 7-019 



Carbon ' 39-819 



Oxygen 53-162 



100-000 



