226 



General Notices. 









Quantity of 





February. 



Coke. 



Anthracite. 



Ashes left 

 from each. 



Temperature. 





stone. 



stone. 



lb. 



Max. 



Min. 



1 



H 



- 



- 



31 



23° 



2 





13 



- 



31 



18 



3 



9 



_ 



- 



28 



14 



4 





14 



- 



30 



22 



5 



H 



_ 



- 



30 



28 



6 





14 



- 



28 



24 



7 



ioi 



_ 



- 



27 



24 



8 





14 



- 



29 



26 



9 



6* 



- 



_ 



30 



27 



10 





9 2 



- 



32 



27 



11 



6 



_ 



_ 



41 



37 



12 





7 



= 



51 



38 



13 



H 



- 



- 



51 



44 



14 





7 



- 



52 



41 



15 



H 



- 



- 



49 



42 



16 





7 



- 



51 



39 



17 



H 



- 



_ 



46 



36 



18 





7 



17i 



53 



38 



19 



4 



- 



4i 



50 



35 



20 





7 



17^ 



56 



40 



21 



5 



_ 



6 



56 



29 



22 





7 



19 



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 



89A= 



127* = 









1 



28J bush 



15 cwt. 7| st. 









In judging of the difference in quantity of the two kinds of fuel, the tem- 

 perature 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 70°, or it may shine the whole 

 day and the thermometer 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 December with January, and get 

 a correct result. We are more likely to come nearer the truth if we compare 

 October with November, and the alternate days of February with each other. 

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

 20s. a chaldron, and anthracite at 32s. per ton, we will find that the expense of 

 heating the orchidaceous house in October last with coke was about 1/. 3s. 10d., 

 and the expense of heating it in November with anthracite was 21. ; or if we 

 take the alternate days of February, 14 against 14, we find the expense of heat- 

 ing with 28 bushels of coke 15s. 6d., and 16 cwt. of anthracite 11. 5s. Id. If 

 we take the two months in which coke was burned against the two in which 

 anthracite was burned, which will not be fair, owing to the nature of the 

 weather, the following are the results : — Coke, 3 chaldrons 27 bushels, 3/. 15s. 

 anthracite, 3 tons 1 cwt. 2 st., 4A 18s. 



