90 



IOWA ACADEMY OF SCIENCE^ 



Benedict* and Lewkowitsche give the following con- 

 stants for cotton seed oil: 



Specific Gravity 99° .8735 



Saponification Equivalent 191—196.5 



lodin Number 100 9—116.9 



The specific gravity is that found by Allen .while the 

 saponification equivalent is also the result of the investi- 

 gations of that author. The lodin number is that found 

 by Wiley. 



COTTON SEED OILS. 



It will be noticed that the specific gravity of the samples 

 investigated varies from .9003 to .9006 and with an average 

 of .90045. This is considerably higher than that given 

 by either Allen or Benedict and Lewkowitsche. 



The limits of the value of the Saponification equivalent 

 as given by Allen are very wide wdiile the other authors 

 give a more restricted limit for the constants of these oils. 



The results from the samples vary from 192.1 to 198.6 

 and with an average of 194.6, the better oils having the 

 higher and the common oils the lower values. 



In the lodin number there is a great variation which 

 depends largely on the nature of the oil, whether of the 

 better grade or not. 



The common and crude oils gave results which came 

 within the limits for the constants as stated by x\llen and 

 also Benedict and Lewkowitsche. 



The better grades of oils, however, give results for the 

 lodin absorption which are much lower than the limits 

 given for the constants by the authors as quoted. 



The methods used in the investigation are those of the 

 Association of Official Agricultural Chemists and pub- 

 lished in bulletin No. 46 of the Division of Chemistry 

 (revised edition). The results given are the average of 

 three determinations for each sample. 



*Oil Fats and \Va.\es. p 306. 



