44 BULLETIN 1375, U. S. DEPARTMENT OF AGRICULTURE 
(24) Before making a test in a new flask, or before using a ma- 
chine that has not been in use for a 24-hour period, a test should be 
made on a preliminary sample so that all the flasks will be uniform 
in condition. 
(25) Scales should be placed on a firm support and care should 
be taken that they are in balance before making a weighing. 
(26) The specific directions given above for making tests do not 
apply to modified forms of testers. 
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