IT 



APPENDIX. 



A. Crack in the ice on a cold ulglit or moruiug. 

 AIR. — 3UO to +320 



B. Ciack ou a mo<ierately warm afternoon. 



C. Craok on a moderately warm aft^^rnoon. 



D. Edge of ice, showing stones and earth driven up the beach. 



C C C C C C. Cracks filled with water, and frozen. 

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