144 



OSMOTIC PRESSURE OF AQUEOUS SOLUTIONS. 



tenance of temperature are, in a general way, the diminution, from 

 series to series, in the fluctuations of bath temperature. It has already- 

 been pointed out, however, that certain series can not be fairly judged 

 by such a comparison. 



Variations in bath temperature during the individual experiments 

 are only a rough measure of thermometer effects. The very complex 

 character of these phenomena and their highly pernicious effects upon 

 the precision of the measurements of osmotic pressure have been dis- 

 cussed in a former chapter, and it is not necessary again to emphasize 

 the necessity of their eliminiation. 



When, as in Series VII and VIII, no fluctuations are given, it is not 

 meant thereby that the temperature was absolutely constant through- 

 out, but simply that the variation was less than 0.05°. In the "final 

 measurements" to be presented in later chapters, it will mean that the 

 variation was less than 0.02°. 



Table 35. — Cane sugar, Series I to VIII. Upward displacements of the manometers (mm.). 



*Not determined. 



