W. O. Atwater on American Maize. 353 
glass flask, of about 75 c. ¢. capacity. _ The flask is then closed 
tents to a constant weight. J 
During the last boiling, moisture is apt to condense in the 
ter, to replace the wet tube with a dry one. <A tube, with the 
horizontal arm 20 em. long, answers well for this purpose. It 
18 of course essential that the interior of the pump be as 
as possible, otherwise a number of hours may be required for 
the completion of the process. Fe 
After the drying is finished, the tube is removed from the 
stopper, the glass rod inserted, and the flask set aside in the 
balance for half an hour or more. The rod is then removed, 
for a moment, to allow access of air to the interior, and 
inserted, when the whole is weighed. The difference of the 
two weighings is the loss of water. The results accord closely 
a8 seen from the subjoined figures. 
i B ‘Water per cent. C. D. 
L I. . II. . i. 8 n. 
809 808 1054 1051 9°78 980 10°75 10-98 
A, had been kept for some months in a very dry atmosphere. 
The others were in the same hygroscopic condition as when 
y, three grams 
enited for from 
