148 



Mr. W. N. Hartley on Attraction and [Apr. 12, 



Temperatures 



of crystal. of attracting body. Effect on bubble. 



45 C 73 C Kepulsion. 



50 83 . . Attraction strong. 



50 78 Bubble attracted horizontally. 



57 74 Attraction against gravitation. 



55 65 No movement. 



55 75 Strong attraction. 



60 65 No movement. 



65 „ . 75 Attraction in any direction. 



65 73 3j J? 



65 70 Attraction. 



65 69 No movement. 



67 73 Attraction. 



67 76 Attraction strong. 



68 75 Attraction against gravitation. 



65 72 Attraction. 



70 75 No movement. 



73 78 Attraction. 



60 65 Attraction feeble. 



Other experiments of the same kind .were made on other cavities, 



which were, however, more difficult to operate on, being smaller in size 

 and of less regular shape. 



Temperatures 



j- Somewhat feeble attraction. 



of crystal. of attracting body. Effect on bubble, 



o o 



60 C 130 C Neither attraction nor repulsion. 



100 180 } 



-j^qq 260 y^ery strong attraction against 



100 160 .'.'.'.....). g^vitation. 



100 140 



100 140 



100 130 No effect. 



Another cavity : — 



75 140 Very strong attraction. 



75 130 Attraction feeble. 



60 130 "J 



60 125 v Attraction feeble. 



60 125 ) 



Here let me explain that attraction or repulsion, when expressed as 

 being feeble, should really be understood as causing a slow motion. It 

 was noticed that bubbles without gaseous contents, which were attracted, 



