White. — Marine Animal Oils 91 



I found that in one sample of eggs there was 44.79 per 

 cent, water, and 22.37 per cent, oil as obtained by extrac- 

 tion with carbon tetrachloride. This makes 49.96 per 

 cent, oil in the dry yolk. 



By extracting the dry yolks with ether, a rather vis- 

 cous, light brown oil was obtained, of slightly fishy odor. 

 This oil contained a solid fat which possibly consisted 

 largely of "stearine," but probably was also composed of 

 "lecithin," a nitrogenous and phosphorized glyceride 

 which is found in egg yolk to a considerable extent. A 

 more intensive study of this oil will be made. 



The constants of the oil are as follows: — iodine num- 

 ber, 124.1; saponification number, 176.0, acid number, 

 8.1; density at 30°, 0.9268; viscosity at 50°, 0.3610. 



* * * 

 The other shark oils are of not enough commercial im- 

 portance on account of the supply, and the qualities of 

 the blubber oils mentioned in Table I are too well known, 

 to be considered here. From the interest in the skate 

 on account of its value for fertilizer and glue, the excep- 

 tionally high iodine value of the liver oil should be noted 

 (this value is exceeded sometimes) and its possible use as 

 a drying oil should be considered. 



