Stufrg 



it " The Butterfly." Curious to relate, the feature is 

 not shown in any photograph of that region which he 

 was able to inspect, but whether that was due to lack 

 of difference of actinic value of the light reflected by 

 the portions or to the rarity of the appearance, he was 

 not able to say. He observed it at the following 

 lunation, when it was not quite so conspicuous. It 

 should be looked for, he says, about twenty-four hours 

 after full moon. Shortly before Christmas of 1914, 

 Mr. Tompkins informed me that it appeared to be a 

 relatively rare occurrence to get a good resemblance, 

 as although he had since observed close approxima- 

 tions to the phenomenon, it had never been quite so 

 good. That, I believe, is not an uncommon experience 

 in regard to the observation of these fancied moon- 

 figures. 



