358 



Mr. J. J. Hood on the Rate of 



dilute hydric chloride on pure white marble, washed and dried 

 by passing through tubes containing broken glass moistened 

 with oil-of-vitriol and two tubes containing calcic chloride. 

 From about thirty-five experiments the following two are 

 selected, the temperature being, as in all the others, 16° 0. 



C0 2 in Air. 



Barometer, 765*8. 



Time, 

 minutes. 



Manometer- 

 reading, 

 millimetres. 

 n. 



Difference of 



pressures. 



n' —n. 



Ratio. 

 n" — n' 



n'—n 







1 



2 



3 



4 



5 



7 



10 



15 



20 



25 



30 



40 



50 



60 



30-6 

 162-6 

 244-6 

 294-3 

 325-3 

 345-1 

 364 

 378 

 392-7 

 403-8 

 413*2 

 421 

 429-7 

 435 

 438-2 



132 



82 



49-7 



31 



19'8 



189 



14 



14-7 



111 

 9*4 

 7-8 

 8-7 

 5-3 

 3-2 



•621 

 •606 

 •624 

 •639 



•945* 



•967 



•963 



C0 2 in Hydrogen. Barometer, 763*2. 



Time, 

 minutes. 



Manometer- 

 reading, 

 millimetres. 

 n. 



Difference of 



pressures. 



n'—n. 



Ratio. 



n" — n' 



n'—n ' 







1 



2 



3 



4 



5 



7 



10 



15 



20 



25 



30 



40 



50 



60 



296 

 202-7 

 302-9 

 350-8 

 375-7 

 389-5 

 407-3 

 423-2 

 435 2 

 439-7 

 442-6 

 444-1 

 4446 

 444-9 

 445 



1731 



100-2 



479 



24-9 



13-8 



17-8 



15-9 



12 



45 



2-9 



1-5 



•5 



•3 



•1 



•578 

 •478 

 •519 

 •554 



•822* 

 •916 



•876 



* The fifth root of the ratio is taken, as the intervals of time are five 

 minutes. 



