1909.] 



NATURAL SCIENCES OF PHILADELPHIA. 



97 



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

 Lansing, Michigan: Leaf buds eased February 1; leaf buds burst 

 February 4 ; first leaf unfolded February 11; all leaves withered 

 February IS. 



Sodium bicarbonate (strong). — University of Pennsylvania: Leaf 

 buds eased January 31. Ithaca, New York: No response. 



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

 Lexington, Kentucky: Leaf buds eased January 31. No response 

 was obtained with branches from New Brunswick, New Jersey, Ithaca, 

 New York, Storrs, Connecticut, Lexington, Kentucky, and Geneva, 

 New York, in weak sodium bicarbonate, strong potassium bisulphate, 

 weak potassium bisulphate, strong hydrochloric acid, strong and 

 weak acetic acid, strong and weak nitric acid, weak chromic acid. 



Hydrochloric Acid (strong). — University of Pennsylvania: Leaf 

 buds eased February 1. 



Acetic Acid (weak). — Lansing, Michigan: Leaf buds eased January 

 29; leaf buds burst February 8. 



Nitric Acid (weak). — Lansing, Michigan: Leaf buds eased January 

 29; leaf buds burst January 31. 



Chromic Acid (weak). — Lansing, Michigan: Leaf buds burst January 

 29; first leaf unfolded January 30; all leaves unfolded February 18. 



Water. — 



Leaf buds eased 



Leaf buds burst 



First leaf unfolded.... 

 All leaves unfolded.... 

 First leaf withered.... 

 All leaves withered.... 

 Flower buds eased.... 



Flower buds burst 



Flowers closed 



Flowers opened 



First flower withered 

 All flowers withered.. 



Uni- 

 versity 



of 

 Penna. 



Jan. 27. 

 Jan. 29. 

 Jan. 31. 

 Feb. 21. 

 Feb. 28. 



Jan. 31. 

 Jan. 31. 

 Feb. 4. 



Penna. 



State 



College. 



Jan. 30 

 Feb. 1 

 Feb. 1 



New 

 Bruns- 

 wick, 

 N.J. 



Jan. 28, 



Jan. 29. 

 Jan. 31, 



Feb. 24, 

 Jan. 27, 



Lan- 

 sing, 

 Mich. 



Jan. 29. 

 Feb. 1. 



Jan. 25, 



Jan'."27. 

 Jan. 28, 

 Jan. 31, 



Ithaca, 

 N. Y. 



Geneva, 

 N. Y. 



Feb. 11 



Feb. 24, 



Jan. 29 

 Jan. 29 

 Jan. 30 

 Feb. 5, 

 Feb. 7, 



Jan. 28. 



Feb. 7. 

 Feb. 8. 



Feb.24. 

 Jan. 29. 

 Jan. 31. 



Feb. 1. 

 Feb. 5. 



Lex- 

 ington, 

 Kv. 



Jan. 29. 

 Feb. 3. 

 Feb.24. 

 Jan. 30. 



Jan. 31. 

 Feb. 7. 

 Feb. 8. 



Linden {Tilia americana). — 



Corrosive sublimate (strong). — University of Pennsylvania: Leaf 

 buds eased February 4. 



Copper sulphate (strong). — No response in twigs from University of 

 Pennsylvania. 

 7 



