some of the poplars were at the other extreme as regards this 

 factor, and suffered very severely. Attention is called to the 

 fact that Ulmus americana ranked twenty-fifth, and Populus 

 ddtoides thirty-first, the last on the list. 



4. Flexibility of stem. The Thujas and Ostryas which ex- 

 hibited a high degree of resistance were in many cases bent into 



American elm. Typical of ccnditicns in city streets. 



semicircular arches for days after the storm, yet very few were 

 broken, and all the others righted themselves after the ice melted. 



5. Strength of materials. High resistance of the oaks was due 

 largely to this factor, the limbs of the oak having, in general, 

 neither great flexibility, favorable angle nor reduced surface. 

 Indeed many of the oaks bore great numbers of leaves during 

 the storm period and the ice accumulated on these as well as on 

 the stems. 



It might be added that some species were favored in many 

 cases by some form of external support. For instance, Carpinus 



