252 



KANSAS UNIVERSITY SCIENCE BULLETIN. 



course, mixing takes place, with the result that an increase in 

 the height of liquid, while not producing this maximum effect, 

 still brings about a marked rise in the reading of the thermometer. 

 It was assumed that the volume correction would be the 

 same for a solution as for pure water, which cannot be strictly 

 true if the weight of the supernatant liquid has any influence. 

 It was found that the boiling-point correction due to variable 

 volume is practically negligible in the case of urea, and made 

 a difference of from 1 to 3 per cent, only in the case of sugar. 

 In tables C to E, inclusive, all the corrections mentioned in a 

 preceding paragraph have been applied to the "boiling-point 

 elevations" to give the "corrected elevations." The corrected 

 elevations are the ones used in constructing curves. Tables C 

 and G are taken as typical for the construction of curves (see- 

 plate VI). 



TABLE C— WATER. 



Barometric variation, .76 mm. 

 Variation of room temperature, 



l.l'^ 



TABLE D.— WATER 



Barometric variation, .34 mm. 

 Variation of room temperature, .9°. 



TABLE E.— WATER. 



Barometric variation, .72 mm. 

 Variation of room temperature, 1.5° 



TABLE F. -WATER. 



Barometric variation, .44 mm. 

 Variation of room temperature, 1.7° 



