PROCEEDINGS 



AMERICAN ACADEMY 



ARTS AND SCIENCES. 



VOL. XVI. 

 PAPERS BEAD BEFORE THE ACADEMY. 



Investigations on Light and Heat 



made and published wholly or in part mth appropriation 



from the Rumford Fund. 



I. 



MARINE BIOLOGICAL LABORATORY. 



Received J?^:-^^7 . / <5 " / /T ^ 

 Accession No. yi '-:h i> 



Given by....^.I U'^i^rFhr-^.e-^. r^^ ^ 



Place, 



*^*^a book OP pamphlet is to be Pemovad from the Uab- 

 opatopy «iitbout the permission of the Tpustees. 



lAL 

 OF 



ks of 

 s de- 

 'alue. 

 small 

 1 the 

 icipal 

 ue of 

 ot at 

 ,here- 

 y the 



values of these constants. 



Let B, b = the diameters of the Sun and of any given star, as 

 seen from the Earth, expressed in seconds of arc. 



Let I = the intrinsic brightness of the star, that of the sun being 

 taken as unity ; in other words, let I denote the ratio borne by the 

 quantity of light emitted by the star to that emitted by the Sun from 

 the same superficial area. 



VOL. XVI. (N. s. vm.) 1 



