512 BoEDDiCKEE — Oil Lunar Radiant Heat. 



Conclusion. 



In conclusion I enumerate a series of observations which the preceding pages 

 have shown to be decidedly desirable and in part possible for the same apparatus 

 — observations which, as far as feasible, I have already begun, and shall lay before 

 the public when tangible results have been obtained. 



a. The debatable decrease of heat before the commencement of the eclipse 

 requires confirmation or the reverse as the case may be. The best way to obtain 

 tliis will consist in observing the near approaches of the Moon to the Earth's 

 shadow — or in observing and discussing the lunar heat at Full Moon on every 

 available occasion. 



b. Observations during totality are much needed. I now think that with some 

 precautionary modifications our ajDparatus may well yield reliable results, and I 

 shall certainly try to obtain them during the next favourable eclipse. 



c. The heat after the last contact with the penumbra requires careful measuring 

 during eclipses differing as much as possible in magnitude. 



d. It is not unlikely that the behaviour and nature of lunar heat may be recog- 

 nized if eclipse-observations are carried on through glass. As far as I know, such 

 observations were only made by Professor Langley on one occasion during totality ; 

 yet detailed and systematically obtained results appear necessary. 



e. Finally, the varying radiation of different parts of the lunar surface — which 

 may have caused many of the irregularities in the results which form the subject 

 of the present paper — requires systematic observing. But this will necessitate 

 either a thorough modification of our apparatus, or perhaps the use of radically 

 different methods of observation. 



