on the Temperature of the Sun. 

 Table VIII. 



541 







Scale- 







Scale- 



Date of 



e. 



divisions. 



Date. 



e. 



divisions. 



obsevv. 





y- 







y> 



Sept. 28 



1-30 



217 



Oct. 21 



480 



1372 





J -40 



213 



ff 



5-40 



128-3 





1-50 



210 



Nov. 1 



1-80 



WS 





1-60 



205-3 







2-00 



187-5 





1-80 



1980 







2-50 



170-2 





2-00 



191-2 



" 



300 



1560 





2-20 



185 





3-50 



1450 







2-60 



172-3 





400 



1367 





3 00 



1620 





4 50 



1300 





3-20 



158-0 





5-00 



123 6 





360 



1520 





260 



1661 





400 



1450 





300 



160-2 





497 



1310 





3-20 



1530 



Sept. 29 



1-40 



206-8 





350 



145-5 





1-50 



202-9 





400 



138-0 





2-00 



184-8 





4-50 



132-7 





2-50 



1690 





4-84 



1300 



Oct. 2 



1-60 



198-7 





5-00 



1281 





200 



1 785 



n 



5 50 



1230 





250 



164-9 





669 



109-0 





300 



1550 





1-80 



1974 





330 



1580 



Oct 19 



200 



190-5 





3-60 



1473 





2-50 



174-9 



Oct. 3 



1-60 



1815 





300 



161-8 





2-00 



164-8 





3-50 



1493 





2-50 



149 2 





400 



137-5 





3-00 



1358 





4-50 



125-5 





350 



125 





500 



1140 





4-00 



1170 





5-50 



104-2 



Oct. 10 



1-60 



2060 





600 



98-8 





1-80 



1980 





550 



118-0 





200 



191-5 





6-00 



1120 





2-30 



1825 



Dec. 17 



2-7 



1800 





2-80 



170-9 





33 



165-5 



Oct. 19 



6-50 



900 





3-9 



1540 





700 



83-0 



Dec. 22 



2-7 



162-3 



Oct, 21 



1-80 



200-9 





3-3 



1480* 





240 



179-8 





39 



137-6 





3-00 



166-6 





45 



128-8 





3-60 



1561 





51 



1203 



>> 



4-20 



1461 



>> 



5-7 



112-5 



IX. Determination of the Thermal Absorption of the Atmo- 

 sphere. 

 The deflections y which have been observed on the galva- 

 nometer are produced by the pencil of solar rays which falls 

 on the face of the pile, after having traversed a stratum of air 

 more or less thick according to the altitude of the sun. In 

 this passage the thermal effect of the rays is greatly lessened 

 through absorption by the air, and especially by the vapour 

 * Hygrometer =100. 



