GENERAL CONSIDERATION OF PLANT DISEASES 



28^ 



The author found the weight of a branch of Liriodendron tulipifera with 

 ice upon it to be 50 grams, without ice 9 grams; so that the ice weighed 

 41 grams, giving a ratio of i : 4.5. Juniperus virginiana with its ice 

 load weighed 310 grams, without ice 13 grams, making the weight of ice 

 297, a ratio of i : 23. Beginning with Dec. 5, 1914, a combination 

 rain, snow and ice storm swept across the Eastern States doing much 



e 



6 



10 



12 



13 W '4 



17 



Fig. 113. — Sectional view of twigs and leaves of various plants showing load of 

 ice carried during the ice storm of Feb. 12 and 13, 1916. i, Acer platanoides; 2, 

 blade of grass; 3, Chionanthus virginicus; 4, Diervilla florida; 5, Forsytkia suspensa; 

 6, Ligusirum vulgare; 7, Liriodendron tulipifera; 8, Platanus orientalis; 9, Populus 

 alba; 10, Populus delloides; 11, Quercus palustris; 12, Syringa vulgaris; 13, Tilia 

 americana; 14, Tecoma radicans; 15, xanthoceras sorbifolia; 16, Spiraa Thunbergii;' 

 17, leaf of Rhododendron maximum; 18, icicle on tip of Rhododendron maximum, 

 leaf hanging down. 



local damage^ and again on Friday, Dec. 31, a severe ice storm visited 

 the mountain region of Pennsylvania contiguous to the Juniata Valley 

 and Susquehanna River. During the afternoon of Saturday, Feb. 12, 

 19 16, a cold rain began which continued well into the night, coating the 

 pavements, streets, and trees with hard ice. On Sunday morning, 

 Feb. 13, men, boys and girls took advantage of the icy streets to skate 

 ' Illick, J. S.: a Destructive Snow and Ice Storm. Forest Leaves, xv: 103- 

 107, February, loifi. 



