1909.] NATURAL SCIENCES OF PHILADELPHIA. 89 



1. Lafayette, Indiana : Leaf buds burst February 1 ; first leaf unfolded 

 February 4. 



Sodium chloride (weak). — Storrs, Connecticut: No response. 

 Lafayette, Indiana: Leaf buds eased February 4; leaf buds burst 

 February 7. 



Ammonium nitrate (strong). — Lafayette, Indiana: Leaf buds eased 

 January 30; leaf buds burst January 31; first leaf unfolded February 

 4; first leaf withered February 8; all leaves withered February 21. 

 Auburn, Alabama: Leaf buds eased January 31; leaf buds burst Feb- 

 ruary 4; first leaf unfolded February 7; all leaves unfolded February 

 11; first leaf withered February 14; all leaves withered February 24. 



Ammonium nitrate (weak). — State College, Pennsylvania: Leaf 

 buds eased January 31 ; leaf buds burst February 1 ; all leaves withered 

 February 24. Ithaca, New York: No reaction. 



Ammonium oxalate (strong). — New Brunswick, New Jersey: Leaf 

 buds eased January 30; leaf buds burst February 3. Ithaca, New 

 York: No reaction. 



Ammonium oxalate (weak). — Lafayette, Indiana: Leaf buds eased 

 January 31; leaf buds burst February 3; first leaf unfolded February 

 4; first leaf withered February 7; all leaves withered February 24. 



Potassium chloride (strong). — College Park, Maryland, and Ithaca, 

 New York: No response. 



Potassium chloride (weak). — Twigs from Storrs, Connecticut, Lafay- 

 ette, Indiana, and Auburn, Alabama, showed no response. 



Sodium bicarbonate (strong). — Twigs from College Park, Maryland, 

 and Ithaca, New York, showed no response. Those from New Bruns- 

 wick, New Jersey, responded by easement of leaf buds on January 30. 



Sodium bicarbonate (weak).— Storrs, Connecticut: No response. 

 Lafayette, Indiana: Leaf buds eased January 29; leaf buds burst 

 January 31; first leaf unfolded February 1; all leaves unfolded Feb- 

 ruary 3. 



Potassium bisulphate (strong). — Twigs from College Park, Maryland, 

 and Ithaca, New York, showed no response. 



Potassium bisulphate (weak). — Storrs, Connecticut: No response. 

 Lansing, Michigan: Leaf buds burst January 29; first leaf unfolded 

 February 3. Lafayette, Indiana: Leaf buds burst February 3; 

 first leaf unfolded February 5; all leaves unfolded February 8; first 

 leaf withered February 11; all leaves withered February 21. 



Hydrochloric Acid (strong). — Twigs from College Park, Maryland, 

 Ithaca, New York, Storrs, Connecticut, showed no response in this 

 chemical. 



