262 



Mr. J. T. Buchanan 



[May 8, 



was formed at the shallow end of the lake, where the ice blocks were 

 collected. As the grains in a block of glacier ice are distributed quite 

 irregularly, the water line of a floating block necessarily cuts a great 

 number of grains, all of which are oriented differently. The ice 

 which was formed during the night along this line was oriented 

 crystallographically by the grain with which it was in contact and from 

 which it appeared to spring in continuation of its crystalHne laminae. 

 This produces a remarkable pattern of lines on the surface of the lake 

 ice contiguous to a block of glacier ice. 



Tyndall has described and figured the minute features of the 

 disintegration of the crystal under the absorption of radiant heat. 

 Similar and complementary features are observed when ice is generated 

 from an existing crystal under the dissipation of heat. To do justice 

 to them, however, would require the services of a skilful, patient and 

 resourceful artist. 



The disarticulating and analysing action of the sun's rays is not 

 accomplished without selection and the expenditure of energy. 

 Accordingly we observe that one grain protects another. The dis- 



