4 BULLETIN 259, U. S. DEPARTMENT OF AGRICULTURE. 
The vats were subject to all the vicissitudes of ordinary use. They 
sometimes lost water through evaporation and sometimes gained it 
through entrance of rain water. The inspectors in charge added 
water, chemicals, or both, whenever in their judgment the strength 
or volumes of the baths needed correction. Naturally, therefore, 
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Fig. 1.— Diagram (vats A to F) showing changes in oxidation of arsenic in dipping baths. 
the straight course of either the full or broken lines connecting each 
two consecutive circles does not mean that the composition of the 
dip changed gradually from point to point. The lines are introduced 
merely to guide the eye from one circle to the next. 
