1909.] NATURAL SCIENCES OF PHILADELPHIA. 93 



Ammonium nitrate (strong). — Lansing, Michigan: No response. 

 Lexington, Kentucky: Leaf buds eased February 7; leaf buds burst 

 February 8. Auburn, Alabama: Leaf buds eased February 3; leaf 

 buds burst February 4; first leaf unfolded February 7; all leaves 

 unfolded February 18; first leaf withered February 15; all leaves 

 withered February 24. 



Ammonium nitrate (weak). — University of Pennsylvania: Leaf 

 buds eased February 7; leaf buds burst February 15. Ithaca, New 

 York: Leaf buds eased February 4; leaf buds burst February 7. 

 Twigs from College Park, Maryland, and Ithaca, New York, showed 

 no response. 



Ammonium oxalate (weak). — No response in twigs from Storrs, 

 Connecticut, Lansing, Michigan, and Auburn, Alabama. 



Potassium chloride (strong). — University of Pennsylvania: Leaf 

 buds eased February 4; leaf buds burst February 8; first leaf unfolded 

 February 14; all leaves unfolded February 24; first leaf withered Feb- 

 ruary 24. Pennsylvania State College: Leaf buds eased February 

 3; leaf buds burst February 5. New Brunswick, New Jersey: No 

 response. 



Potassium chloride (weak). — Storrs, Connecticut: Leaf buds eased 

 February 3 ; leaf buds burst February 4 ; first leaf unfolded February 

 14; all leaves unfolded February 18; first leaf withered February 21; 

 all leaves withered February 24. Lexington, Kentucky: Leaf buds 

 burst February 3. Auburn, Alabama: First leaf unfolded February 4; 

 first leaf withered February 14; all leaves withered February 15. 

 Twigs from New Brunswick, New Jersey, Lansing, Michigan, Storrs, 

 Connecticut, Lafayette, Indiana, Auburn, Alabama, Lexington, Ken- 

 tucky, showed no response in strong sodium bicarbonate, weak potas- 

 sium bisulphate, weak hydrochloric acid. 



Sodium bicarbonate (weak). — Storrs, Connecticut: Leaf buds burst 

 February 1. Lexington, Kentucky: Leaf buds eased February 7; 

 leaf buds burst February 7. Auburn, Alabama: Leaf buds burst 

 February 14; first leaf unfolded February 14; first leaf withered 

 March 14. 



Acetic Acid (weak). — Auburn, Alabama: Leaf buds burst February 

 8; first leaf unfolded February 8. 



Nitric Acid (weak). — Storrs, Connecticut: Leaf buds eased February 

 7. Auburn, Alabama : No response. 



Chromic Acid (weak). — Storrs, Connecticut: Leaf buds eased Jan- 

 uary 30; leaf buds burst January 31; first leaf unfolded February 11 ; 

 all leaves unfolded February 21 ; first leaf withered February 28; 

 all leaves withered March 4. Auburn, Alabama: No response. 



