SEE BAratA 



20 



The Vegetation of the 



above named transactions, 

 with corrected, will prove 



but full of printing errors, and, therefore, here- 

 that. 



Eleven series were calculated in that way as far as ten degrees above 

 freezing point. As the figures diverge more and more, it seems that the 

 sap of our woody plants moves as soon as the temperature rises above 

 freezing point, for there the figures come nearer together. Only Robinia 

 makes an exception, the starting point of which is probably one degree 

 above freezing point. 



This is a Southern tree and at Peoria introduced, but as the observa- 

 tions were made on an individual, standing right near the place of obser- 

 vations, these are the most reliable. 



How much later these plants would have been in bloom in the year 

 1857, when the negative temperatures acted reactive instead of inactive, 

 can be proved by the following table: 



1857. 



Sum of daily mean tem- 

 perature 



Sum of daily mean above 

 freezing 



Number of days with a tem- 

 perature above freezing. 



■ 1859. 



Sum of daily mean tem- 

 perature 



Sum of daily mean above 

 freezing 



Number oidays with a tem- 

 perature above freezing. 



Jan. 



.320 

 6 

 4 



-73 

 67 

 19 



Feb. 



47 



106 



24 



26 



84 

 18 



Mar. 



27 



108 



21 



225 



226 



31 



Apr. 



142 



163 



28 



275 



279 



30 



May 



Jan.— May. 



465 



465 



31 



616 



615 



31 



Feb.— May, 



361 



848 

 108 



1068 



1261 



12i9 



681 

 842 

 104 



1141 



1204 



110 



