•206 



PHOCEBOINOS OK Till. 



Feliruary 



Coke. 





Quantity of 







Anlhracile. 



iisiu's left 



Temperature. 









( from eacli. 









btone 



htoue. 



lbs. 



Ml V 



i> 1 llA . 



Mill 

 i>i III. 



1 



8i 







\J 1 





2 





13 





1 



1 n 



3 



9 







9ft 



11 

 1 I 



4 





14 





MO 



99 



5 



9i 









9fi 



6 





14 





9ft 



94 



7 



lOi 







97 



94 



8 





14 





29 



26 



<^ 



6i 







30 



27 



10 





94 







97 



11 



6 







41 



S7 



12 





7 







•jn 



13 



5i 







51 



44 



14 





7 





52 



41 



15 



4i 







4Q 



49 



16 





7 





51 



39 



17 



5i 









oo 



18 





7 



17i 



53 



^ft 



U) 



4 





4i 



50 



35 



20 





7 



17 



56 



40 



21 



5 





6 





9Q 







7 

 / 





42 



38 



23 



5 





4 



44 



32 



24 





7 



21 



40 



36 



25 



5 





6 



42 



35 



26 





7 





48 



35 



27 



5 







45 



32 



28 





7 





47 



32 





89^ — 



127i = 











281 bush. 



15 cwt. 7ist. 









In judging of the difiference in quantity of the two kinds of 

 fuel, the tenfiperature is not the only thing to be considered. 

 When the weather is calm less fire is required than when it is 

 windy, the temperature of the external air in both cases being 

 the same ; and even the mean sun heat given above will not 

 enable a person to form a correct idea unless he knows at the 

 same time how long the sun has shone. The sun may shine 

 for one hour in a day in which the registering thermometer 

 may indicate 7^, or it may shine the whole day and the thermo- 

 meter only rise to 70°, yet every one knows that much less fire- 

 heat would be required in the latter case than in the first. 

 Taking these things into consideration, we cannot compare De- 

 cember with January and get a correct result. We are more 

 likely to come nearer the truth if we compare October with No- 

 vember, and the alternate days of February with each other. 

 By referring to the quantity burned, and taking coke at an 



