1889.] On Selenic Acid and other Selenium Compounds. 



25 



100°, and it supplied the following strengths, down to 82* 52 per cent, 

 "by progressive dilution. That of 81*73 per cent, was prepared by 

 concentration on the water-bath, and the remaining four by dilution 

 of the latter. Neither the acid heated in a vacuum, nor that which 

 was kept on the water-bath, contained any trace of seleuious acid. 



Table I. 



Percentage of anhydrous 





selenic acid. 



Specific gravity. 



99*73 



2*6083 



99-08 



2-5993 



98-68 



2*5901 



98-16 



2*5790 



97-37 



2*5676 



96-97 



2*5595 



96-16 



2*5424 



94-74 



2*5105 



93-70 



2-4852 



92-83 



2*4534 



91-59 



2*4218 



90-06 



2*3863 



89-20 



2-3642 



88-55 



2-3402 



87-34 



2-3158 



86-60 



2-2946 



85*67 



2-2712 



84-59 



2-2463 



83-82 



2-2196 



82-52 



2-1878 



81-73 



2-1694 



80-86 



2-1438 



79-99 



2-1213 



79-06 



2-0940 



73-43 



1-9659 



Table II is calculated from Table I, and gives specific gravities 

 interpolated from equal increments of strength. It will, perhaps, be 

 found most convenient for purposes of calculation, and for showing 

 the relation of the rate of increase of specific gravity to that of 

 the strength. 



