MofiS—Chemtcnl Notrs on ,t Slonc Lamp f mm Ballijhetmili. 103 



This greasy sul)stancc burned with a smoky flame like tallow. Its specific 

 gravity at the temperature of 1, oiling- water was 970-5 compared with-water 

 at 15° G. This is much liiglier than the specific gravity of lallow. The 

 specific gravity of an old specimen of tallow under the same conditions was 

 found to be 904'6 ; l^ut on heating it for some hours its specific gravity rose to 

 923-7, and prolonged heating leaves a residue heavier than water. 



Fio. I. 



The substance dissolved almost completely in alcoliol, leaving a small, 

 flocculent, tlark-brown residue. The alcoholic solution liad an acid reaction 

 and it took 17-8 c.c. of an alcoholic solutimi of caustic potash, containing 

 0-101 grm. of potassium hydroxide, to neutrahze the acid in 0-727 gramme of 

 the original substance, using phenolphthalein as an indicator. Ou heating 

 with an excess of alkali no saponification took place ; it is evident, therefore, 

 that no tinaltercd fat is present. "Wlien the excess of alkali was neutralized, 

 the solution evaporated to drjniess, and, extracted with petroleum-ether, the 

 latter left a slightly yellow wax -like residue, weighing 0"117 gramme. This 

 is probably a hydrocarbon. The portion insoluble in petroleum-ether dissolved 

 in water, and, mi adding a slight excess of dilute sulphuric acid, fatty acids 



