oo al 
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= _* Graduating 
College, July, 1869. 
weighed off, and quickly transferred toa dry round-bottomed 
352 W. O. Atwater on American Maize. 
Art. XXXIII.—Contributions from the Laboratory of the Shef- 
field Scientifie School, Yale College. No. XXIL—On the proz- 
tmate Composition of several varieties of American Maize ;* by 
W. O. Atwater, Ph.D. 
Tue four varieties of Indian corn analyzed are as follows: 
A. Early Dutton Corn—An early variety, yellow in color, 
twelve rowed, kernels rather small. Ears medium size. One 
Brown-red color, eight rowed, ears and kernels often quite large. 
D. Stowell’s Evergreen Sweet Corn.—Specimens are sold un- 
der this name, having twelve and sixteen rows, ears short and 
thick. 
finer with sand in a porcelain mortar. “The specimens for anal- 
ysis were all ground at the same time, and set aside for use 12 
well closed bottles. 
_ Determination of water.—The accurate estimation of hygro- 
scopic water is often attended with difficulties, owing to the ex- 
treme slowness with which the last traces of water disappear, 
as well as to the fact that, from long continued heating there re- 
sults an oxydation of fatty matters and an alteration and loss 
of other elements. 
At the suggestion of Prof. Johnson, use has been made © 
the Bunsen pump, and the following method adopted, by which 
the above difficulties have been obviated, to a great exten 
One or two grams of the very finely divided material are 
ing Thesis presented to the Faculty of Philosoply and the Arts, Yale 
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