68 P. C. Ray — Chemical Examination of [No. 1, 



N 

 4*8 c. c. — HOI were required by ( 1 ) for the excess of alkali. 



■^"'^ )) )> )> 55 \^) 55 J) 5> 



o -fl r • 1 f wi> 11-4X 0-02805 xl QS -„^. 

 Saponification equivalent of (1) = ^ = 190*0 



„ , ,,> 8-9 X 002806 X 305 .„„„ 

 Do. do. (1) j:gjj5 = ]89-9 



Saponification equivalent of Lard.* 



1. 1*424;5 gm. lard were heated over a water-bath with 20 c. c. alco- 

 holic potash solution. 



2. 1*432 gm. lard heated as above with 80c. c, alcoholic potash 

 solution — 



20c. c. KOH =15-8c. c.^HCl 



30 „ =23-7 „ 



ned 59c. c 

 (2) „ 13*7 „ 



N 

 (]) Consumed 5-9c. c. — HCl for the excess of alkali. 



Saponification equivalent for (1) = =194*9 



., . (2) = «!>i2:°||2ii2! = 195-9 

 Mean of two= 195*4. 



ESTOIATION OF GLYCERIN ACCORDING TO FOX AND 



WANKLYN'S METHOD, AS IMPROVED BY 



BENEDIKT AND ZSIGMONDY. 



In view of the contradictory statements which have appeared fi'om 

 time to time as regards the applicability of this process, a few preli- 

 minary experiments were vmdertaken with the object of testiDg its 

 trustworthiness : — 



(a) A solution of pure oxalic acid was divided into two equal 

 portions. The oxalic acid was thrown down by means of calcium acetate 

 in pi'esence of acetic acid. The oxalate precipitate was in one case 

 dissolved in hot hydrochloric acid, the solution diluted with water 

 and further acidified with sulphuric acid, warmed to about 60°, and 

 titrated against accurately standardised permanganate solution. In 

 another case the oxalate precipitate was converted by ignition into lime. 



* The lard was a standard sample and was not taken off any particular part of 

 the pig's carcass. 



