186 Mr. E. J. Caldwell. Hydrolysis of Cane Sugar [June 16, 



18 per cent. (0'5 gramme molecule) milk sugar, 0-400 gramme molecule 

 d-camphor-/3-sulphonic acid. Temperature, 60'l. 



Per cent. 10^ , __^ 



Time in hours. a D hydrolysed. t ' 10 a-x 



20-90 



8 21-73 14-9 [1-46] 



16 21-93 18-5 0-93 



22 22-37 26-4 I'Ol 



44 23-45 45-8 1-01 



72 24-30 61-0 0-95 



95 24-88 71-5 0-96 



Complete change ... 26-47 Mean ... 0'97 



K (for normal acid) = 2 -43. 



Although possibly affected by a considerable error, on account of the 

 difficulty attending such observations at high temperatures, these 

 results appear to indicate that the activities of the two acids are by no 

 means the same towards cane sugar and towards milk sugar, being 

 about 100 : 90 in the one case and 100 : 70 in the other. Sigmond has 

 already shown* in the case of cane-sugar and maltose, that although 

 sulphuric and oxalic acids have the same relative activity towards both 

 carbohydrates, chlorhydric acid is relatively more active towards 

 maltose : it appears, therefore, that cane sugar is less sensitive to attack 

 by chlorhydric acid than are other sugars. The point is one which 

 deserves further investigation. 



Although the experiments described in this note have given a negative 

 answer to the question considered, it is proposed to extend the inquiry 

 to other acids. 



* ' Zeits. Phys. Chem.,' 1898, vol. 27, p. 390. 



