TEMPERATURE OF TIIK SURFACE OF THE MOON. 



39 



ery case allowed to comuiunicate its own temperature to the bolometer before being exposed to the 

 lunar or solar rays. 



Traiismimioii of xohir nuliulioii hi/ i/hiss. 



[ Dt'cembt'i- 3. 1884. Sun's zonitli distance at apparent noon ()d° 43'. Siinhcuiii tliniinislu'il in intensity to about 

 0.00530. The transmission is obtained by dividinj; the detloction, when tlio niys pass tlmnigli glass, by tlieniean of 

 the adjacent dellei-t ions in the direct solar beam.] 



Traiisiiiisniun of Iniiiir rndiai'ion bi/ glasx. 

 [November 26, 1884. A good sky. External temperature — 5"^. C. Barometer, /3^7.26 decimeters ] 



Lnnat radiation: Mean transmission (glass outside) 119 



Mean transmission (glass inside) 126 



Mean of all observations 122 



There is very little difference between the results for transmission with glass inside and out- 

 side the building, and this little may be entirely accounted for by the diflusiou of the rays by the 



