250 



Data. — Diameter of the glass disk. 



1 Measurement 10 . (i02 cm. 



2 Measurement 10.69S cm. 



3 Measurement 10 . 727 cm. 



4 Measurement 10 . 694 cm. 



5 Measurement 10.645 em. 



6 Measurement 10 . 674 cm. 



7 Measurement 10 . 702 cm. 



Average 10.6898 cm. 



Fig. 



Test No. 1. — The number of grams to separate the disk from water 

 at 4° C. 



Trial 1 48 . 725 



Trial 2 48.730 



Trial 3 4S.725 



Trial 4 48.733 



Average 4S . 728 



