possessing the properties of Tallow , 181 



dies of the size employed. It was also contrived to cast a wax 

 candle for the sake of more perfect comparison. 



The following are the results of an hour's comljustion : 



Weight In grains. At the end 



Wax , - - - - 



Half Piney Tallow, half wax 



Spermaceti - - - - 



Half wax, half sperm. - 



Piney Tallow 774 



From these two sets of comparative experiments, which, allow- 

 ing for the smaller size of- wick in the latter, coincide tolerably- 

 well, we are led to conclude, that the Piney Tallow approaches 

 nearer to animal tallow in its rate of combustion, than to any of 

 the other substances employed ; as indeed we might be led to 

 suppose, from its melting point being nearly the same. 



It may be objected to these experiments, that they do not ad- 

 mit of sufficient precision to enable us to come to any accurate 

 conclusion, and it must be admitted that they are only ap- 

 proximations to the truth. That I might be enabled to judge, 

 however, to what degree of probable error I was liable, I had 

 nix candles of the best animal tallow, cast in the same mould as 

 the rest, with wicks of twelve threads, and these I burned for 

 one hour as before, using the same precautions. I first performed 

 the experiment, snuffing them every ten minutes, and then without 

 snuffing them at all, being desirous collaterally to ascertain what 

 difference in the combustion the snuffing would cause. 



The following are the results : — 



Snuffing every ten minutes. 



