192 



Dr. W. Marcet. On the 



Ninth Analysis. 



Difference from 

 means. 



1st — Volumetric method .... 2*780 0*4 per cent. 



2nd „ „ .... 2768 0*08 „ 



3rd „ „ .... 2-762 0-3 



Mean 2*770 



By Pettenkofer's method 2*774 



Difference 0*004= 0*15 per cent. 



Tenth Analysis. 



Difference from 

 means. 



1st — Volumetric method 4*093 0*07 per cent. 



2nd ' „ „ 4*089 0*05 „ 



3rd „ „ .... 4*088 0*05 „ 



Mean 4*090 



By Pettenkofer's method 4*044 



Difference 0*046=0*9 per cent. 



Eleventh Analysis. 



Difference from 

 means. 



1st — Volumetric method 3*563 0*4 per cent. 



2nd „ , 3*560 0*4 „ 



Mean 3*561 



By Pettenkofer's method 3*575 



Difference 0*014=0*4 per cent. 



Twelfth Analysis. 



Volumetric method 4*339 



By Pettenkofer's method 4*305 



Difference 0-034=0*8 per cent. 



Thirteenth Analysis. 



1st — Volumetric method 2*026 



2nd „ , 2*022 



Mean.... 2*024 



By Pettenkofer's method 2'024 



Difference 0-000=0*0 per cent. 



