6 
BULLETIN 1460, U. S. DEPARTMENT OF AGRICULTURE 
means of a gas-pressure regulator. 4 Frequent cheek tests were made 
to keep the heat constant. 
Pig. 2. — Kjeldahl distilling apparatus with glassware in position for making test. Supply 
of caustic soda and automatic pipette at left of the still 
ACID NECESSARY FOR DIGESTION OF WHEAT SAMPLES 
The acid used by the various collaborators varied considerably, 
regardless of size of sample. Experiments were made, therefore, to 
determine how much acid was actually needed to digest wheat 
samples completely. 
4 Coleman. D. A. and Boerxer, E. G. the browx-duvel moisture tester axd how 
TO use it. Dept. Bui. 1375, p. 22. 1926. 
