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 J') 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. 



