64 Report oF THE Boranist oF THE 
Taste I.—MINIMUM TEMPERATURE AT VARIOUS PLACES IN NEW 
York on May 10 anp 11, 1902. 



























guinTGn oy!) | rbsinlams lTeab breton (Dectiy Attia See a a 
28: 2899 23:826: 124 | 30; :28. 22S u2eeree. 
Western Plateau. Mien COA werk ers Zia < has anh got 
BES 282 275 2ESEL5 ASO 2 ae ed eee 
29. RR ES Res 295° Lids el ae ee 
Eastern Plateau. 33.) 422% 25. /25;¢¢ 2414 33.9) 5 36 | 20m 2a P24. eeiniee. 
| 23. 2. 4 2G 8 28s 22. TO Bae eke cet ae 
1 Wy eae ee We Geeta ea se A ee Pe 28.17. 
Northern Plateau. 99° 91° 17) 90, 92° 94.| 21. 99° 95) 97, 93° 30. 
Atlantic Coast. | 34. 3/7. 38. .38.. 389: 388. | 32. -3/. 40. 400 Zee 
Hudson Valley. | 30... 24.. 33, 28. 30, 36.4) 32. 26. wai OD len omnes 
Mohawk Valley. | 23. .22.:.24. 26. 36. 26. 
Champlain Valley. } 27.9 28% 27) 2QOe02S, Qi Bk? 2S. 3200 SOR PRG tee 
St. Lawrence Valley. | DADO er 0 ela 23. 20,  oU0 eee 
ie © i = 
AR sata 32. 29. 33. 27. 30. 26.. 28. 34. 30. 28. 
erent alee. 29. 29. 36, 27. 31. 29. 29. 29. 
Central Lakes, DU ad. Tate pe eee US ade 2) oh. ee 




In some localities there were also light frosts on May 12 
and $4. 
MANNER IN WHICH THE INJURY WAS BROUGHT ABOUT. 
While the writers were endeavoring to determine the various 
stages in the process by which the injury was brought about and 
formulating a theory to account for them, there came to hand 
the May number of the Zeitschrift fiir Pfhanzenkrankheiten con- 
taiminy Dr. Paul Sorauer’s article “ Frostblasen an Blattern ’” 
(Frost blisters on leaves). Evidently Sorauer observed iden- 
tically the same phenomenon on apple leaves in Germany in 
1901. 
According to Sorauer’s view, the separation of the epidermis 
from the mesophyll is the result, not only of the formation of 
ice crystals (which he admits is a plausible theory), but also of 
the different degrees of expansion of different tissues when sub- 
3Sorauer, Paul. Zeit Pfflanzankr. .123:44-47. Mit Tafel Il. May 12, 1902. 
