(96) 
CANE SUGAR. 
Di aT me TC SMITS. 
Coneentration in gr. pm Concentration in gr. Pm 
mol. per 1000 gr. HO. in man: Hg. mol. per 1000 gr. ek in mm. Heg. 
0.1506 0.084 0.02602 0.086 
0.2653 | 0.084 0.17225 0.086 
0.4993 | 0.087 0.45415 0.087 
1.0122 0.0905 1.0811 0.090 
It is remarkable that the agreement of Mr. Drrererricr’s results 
with mine for Na Cl-solutions, which was closest before, is now least 
perfect, while the agreement for cane sugar may be said to be absolute. 
If we leave the oscillation for the two smallest concentrations 
out of account, the agreement of the H,SO, solution is also very 
close. It is very difficult to find an explanation for this fact, as an 
error in the constants of our apparatus cannot cause this difference. 
Mr. Drerrrrcr puts the solutions and the water in small platinum 
tubes, 3 em. high and with a diameter of 1,2 e.m., which are 
connected with the apparatus in such a way (cemented), as to 
exclude shaking, whereas I put the solutions and the water in glass 
bulbs connected with the apparatus by means of mercury valves, 
in order to be able to shake them thoroughly. I consider this of 
the highest importance, both when freeing the solution and the 
water from air and during the experiment. 
I consider shaking as necessary for preventing differences of 
temperature, Mr. Diprericr, on the other hand, fears to bring them 
about by shaking. If, however, I read the manometer ten minutes 
after having shaken the bulbs carefully, I get always the same 
results by repetition of the experiment. 
Moreover in Mr. Dinrerici’s experiments the platinum tubes which 
lead to the bottle and are cemented to glass tubes, are not quite 
immersed in the icebath, which may cause slight differences of 
temperature, specially because these small platinum tubes have a 
small thermal capacity. 
Mr. Drererici, who himself, makes the preceding remark, thinks 
it possible that a difference of temperature of 0,0025° may occur, 
in spite of this careful protection of the icebath against absorption 
of heat. As a difference of temperature of 0,0025° agrees with a 
