1909.] 



NATURAL SCIENCES OF PHILADELPHIA. 



103 



Weak Potassium chloride (York Imperial Apple). 



Storrs, Conn. 



Leaf buds eased February 1. 



Leaf buds burst February 3. 



Auburn, Ala. 

 February 14. 

 February 15. 



Strong Sodium bicarbonate (JUsculus hippocastanum). — 



University of 

 Pennsylvania. 



Leaf buds eased February 1 . 



Leaf buds burst February 7. 



First leaf unfolded 



Penna. State 



College. 

 January 30. 

 January 31. 

 February 11. 



Weak Sodium bicarbonate (Red Astrachan Apple). 



Storrs, Conn. 



Leaf buds eased February 1. 



Leaf buds burst 



First leaf unfolded February 4. 



(Clapp Favorite Pear). — 



New Bruns- 

 wick, N.J. 



February 4. 

 February 7. 

 February 11. 



Auburn, Ala. 



Storrs, Conn. 



Leaf buds eased January 31. 



Leaf buds burst February 3. 



(Populus monilifera). — 



Storrs, Conn. 



Leaf buds eased 



Leaf buds burst February 1. 



First leaf unfolded 



Lexington, Ky. 

 February 7. 

 February 7. 



February 7. 

 February 21. 



Lansing, Mich. 

 February 1. 



Auburn, Ala. 



February 14. 

 February 14. 



(JEsculus hippocastanum). — 



Lansing, Mich. 



Leaf buds eased February 4. 



Leaf buds burst February 7. 



First leaf unfolded February 11. 



Lexington, Ky. 

 February 3. 

 February 7. 

 February 11. 



In this case the buds developed coincidently from widely separated 

 localities upon a European forest tree. Is this an evidence that 

 Msculus hippocastanum is not acclimated, or an evidence that as a 

 more plastic species that it is more thoroughly so. Yet in the next 

 experiment there is a difference. 



Strong Potassium bisulphate (jEsculus hippocastanum). — 



Geneva, N. Y. New Brunswick, N. J. 



Leaf buds eased January 30. February 4. 



Leaf buds burst February 3. February 5. 



