46 



Fading Histories. 



[Feb. 



The following processes have been made use of: — 



1. Direct titration of the fats and oils by alcoholic potash — Koett- 

 storfer's test. 



2. Estimation of the amount of glycerin. 



3. Iodine absorption — Test of Hiibl. 



4. Estimation of the volatile fatty acids — Reichert's test. 



For convenience of reference the results obtained are presented 

 below in a tabulated form : — 



SUMMARY AND CONCLUSION. 



It would thus appear that as the saponification equivalents of niger- 

 seed oil, mowa-fat, mutton-tallow, sesame oil, lard and earthnut oil are 

 very close to one anothei^ their admixtui'es in considerable proportions 

 cannot be detected by Koettstorfer's test. Even the saponification 

 equivalent of ghee is not far removed from that of lard or tallow. The 

 saponification equivalents of mustard oil and cocoanut oil ai^e, however, 

 hio-bly cliaracteristic. The iodine numbers on the other hand afford ns 

 valuable hints as to the nature of adulteration, the most remarkable 

 features beino- the exceedingly low numbers for cocoanut oil and for ghee. 

 The results of the application of Reichert's test will be communicated 

 later on. 



The paper will be published in full in the Journal, Part. II. 



6. Fading Histories.— By S. E. Peal, Esq., F.R.G.S. 

 The paper will be published in the Journal, Part III. 



