262 



Influence of Colour on the 



No. 



5 



G 



7 

 8 

 9 



10 

 11 

 12 



13 



14 

 15 



16 



17 



18 

 19 

 20 

 21 



22 



23 

 24 

 25 



Nature of Coating. 



Litmus blue, 

 Prussian blue, 

 Ammoniacal Sul-) 

 phate of Copper, J 

 Peroxide of Man- ) 

 ganese, . . J 

 India Ink^ . . . 



Bi-chromate of ) 

 Potassa, . . j 



India Ink, . . . 



Alkanet, . . . 



Carbonate of Lead ) 

 in oil of lavender, j 

 Sulphuret of Lead, 

 Alkanet blue, 

 Carbonate of Mag- \ 



nesia, , . . ] 

 Carbonate of Lead 1 



in gum, . . f 

 Carbonate of Lime, 

 Vermilion, . . 



Sulphate of Baryta, 



Golden Sulphuret) 

 of Antimony, j 

 Indigo, .... 

 Cochineal, . . . 

 Red Lead, . . 

 Sulphate of Baryta, 



Plumbago, . . 



Chromate of Lead, 



Gamboge, . . . 



Bi-sulphuret of 

 Tin, . . . 



Colour. 



} 



Blue, . . 

 Blue, . . 



Greenish-blue, 



J Brownish' \ 

 t black, j 

 Black, . 



Brown, 



Black, . 

 Crimson, 



White, . 



Black, . 

 Blue, . . 



White, . 



White, . 



Dingy white 

 Red, . . 



White, . 



Brown, . 



Blue, . . 

 Crimson, 

 Orange, . 

 White, . 



Black, . 



Yellow, . 



Olive-green, 



Yellow, . 



o S3 



Date. 



Oct. 31. 

 ... 25. 



Nov. 6. 



... 18. 

 ... 17. 



... 1. 



... 18. 

 ... 11. 



... 21. 



... 21. 

 ... 11. 



Oct. 13. 



... 24. 



... 11. 

 ... 25. 



Nov. 15. 



Oct. 31. 



Nov. 11. 

 ... 1. 

 ,, C. 

 ... 21. 



... 17. 



... 6. 

 ... 20. 



Oct. 31. 



Time of 

 cooling, 



Seconds 

 728 

 729 



789 



804 

 804 



810 



817 

 828 



830 



837 

 838 



846 



864 



865 

 872 



873 



909 



912 

 944 

 952 

 957 



974 



977 



1005 



Remarks on 

 Surface. 



Rough. 



Rough. 



/Not shining 

 ( but uniform. 



Not smooth. 

 f Streaked, 

 < streaks 

 ( smooth. 



Smooth. 

 f Not shining 

 \ but uniform. 

 f Smooth, not 

 \ shining. 



Rough. 



Smooth. 



Medium. 



Smooth. 

 f Rough blue- 

 ( ish-white. 

 f Smooth, in 

 ( streaks. 



Smooth. 



Smooth. 



Smooth. 



Medium. 

 f Not shining 

 ( but uniform. 



Smooth. 

 C Smooth, in 

 / streaks. 



1085 Smooth. 



The results thus exhibited are decidedly unfavourable to the 

 specific effect of colour in determining the radiating powers of 

 bodies. Blue is above black at the beginning of the table, and 

 occurs again in the eighteenth place. Although the first seven 

 numbers are blue or black, the ninth, tenth, eleventh, and 

 twelfth, are white, black, blue, and white respectively. Red oc- 

 cupies the eighth and nineteenth places, and then an intermediate 

 one, namely, the fifteenth. White is in the greater number of 

 cases in the middle part of the table, ranging close to black. 



The alleged advantages of dark clothing during cold weather 

 thus seem to have been too hastily inferred ; and it appears that, 



