INVESTIGATIONS RELATIVE TO ILLUMINATING MATERIALS. 405 

 ORGANIC ANALYSES OF LIGHT-HOUSE OILS. 



No. 1. — Refined winter-pressed lard-oil. 



EXPERIMENTS OF MIXING OILS WITH OIL OF VITRIOL OF GQ'=' BEAUME, 



AT 62° F. 



First experiment. — Winter -pressed lard-oil. 



[Of oil, 2 fluid ounces ; of acid, 1 fluid ouuce : J 



Temperature of oil before 11 ixiug 70^ F. 



Temperature of oil after slow mixing 130° 



Difference G0° 



At the expiration of 3 minutes, temperature 134° 



At the expiration of 4 miiuites, temjierature 1-'M° 



Second experiment. — Winter pressed lard-oil. 



Temperature before mixing 70° F. 



Temperature after mixing rapidly 169° 



Difference 99© 



