62 



^ ac 52 S S c 2 B 



Name ^ £ .y | "o "^ -H i ^ | 



o) Si .t; •- 5f "^ •-■ "S P .ti 



0) .2 1) -o -^ 



.•= -u > S Q 



^cer saccharinnm^ 20 X I2 16.0 3.0 



Carya ovata"^ 17X17 170 3.0 



Quercus alba^ 18 X 13 15.5 4-75 



Populus delloides^ 23 X 17 20. o 4.5 



Betula sp? 14 X 10 12.0 1.5 



Tilia americana 23 X 23 23.0 ■ 3.0 



Tilia americana 23X19 21.0 2.0 



Tilia americana 25 X 20 22 . 5 2.5 



A cer Negundo 26X26 26.0 3.5 



Acer Negundo 26 X 18 22.0 3.0 



A cer Negundo 35X20 27.5 4.0 



Ulmus americana 26 X 23 24 . 5 3.0 



Prunus sp 38 X 24 31.0 3.5 



Increase in Twig Weight 



y .2 4J" 



C O c "^ 

 en O) — 



13.0 



14.0 



10.75 



15-5 



10.5 



20.0 

 19.0 

 20.0 



22.5 

 19.0 

 23 -5 

 21.5 

 27-5 



rt 03 



433 

 466 

 226 



344 

 700 

 666 

 950 

 800 

 642 

 633 

 587 

 716 



785 



Twigs from different trees were taken into the laboratory and 

 weighed. After the ice had melted off they were reweighed. 

 Several series from different localities were thus studied at 

 different times. The data is here combined in one table. 



M 



CO 



B .^ E 



^ Name m -S 



S 15 <u 



3 ^ .y 



I Tilia americana 49-0 



I Acer saccharinmn 54 ■ o 



I Prunus virgiftiana 48 . o 



I Carya ovata 97-0 



I Crataegus sp 32 . o 



I Fagus grandifolia 164 . o 



I Carpinns caroliniana i o . o 



I Ulmus fulva 197 . 5 



I Picea ahies 1 1 7 • 5 



I Picea abies 200 . o 



^Second storm, March 18. 



^ .£? 



bD'" 



1 



-C bt) 



03 



01 



is 









30 



46.0 





15 





2 



52.0 





26 





2.4 



45 6 





19 





3.8 



93-2 





24 





0.9 



311 





34 



5 



5-0 



159.0 





31 





I.O 



9.0 





9 





9.2 



188.3 





20 





5-5 



112. 





20 





16 



188.4 





16 





