1909.] NATURAL SCIENCES OF PHILADELPHIA. 79 



flower buds on twigs from Michigan responded on January 29 and 

 burst on February 3. The leaf buds responded February 1, burst 

 February 11 together with the unfolding of the first leaf. The leaf 

 buds on twigs from Lafayette, Indiana, responded February 1, burst on 

 February 3 ; the first leaf unfolded February 4 ; all the leaves expanded 

 February 6. By February 14 all the leaves had withered. The twigs 

 from Auburn, Alabama, responded poorly by the unfolding of the first 

 leaf on February 21. 



Having described the course of development of the buds and twigs 

 from three different varieties of apple, we may tabulate the remainder 

 of the observations in order to shorten the descriptive account. 



Apple (Red Astrachan). — 



Corrosive sublimate (strong). — College Park, Maryland: Leaf buds 

 eased February 4; leaf buds burst February 5. 



Corrosive sublimate (weak). — Auburn, Alabama: Leaf buds burst 

 February 7; first leaf unfolded February 14; all leaves unfolded Feb- 

 ruary 24; first leaf withered February 15. 



Copper sulphate (strong). — College Park, Maryland : No response. 



Copper sulphate (weak). — Auburn, Alabama: Leaf buds eased Feb- 

 ruary 7; leaf buds burst February 8; first leaf unfolded February 11 ; 

 all leaves unfolded February 21; first leaf withered March 7; all 

 leaves withered March 11. 



Sodium chloride (strong). — College Park, Maryland: Leaf buds 

 eased January 30; leaf buds burst January 31. Pennsylvania State 

 College : First leaf unfolded February 5. 



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

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

 4; all leaves unfolded February 7; first leaf withered February 14; 

 all leaves withered February 18. 



Ammonium nitrate (weak). — College Park, Maryland: Leaf buds 

 eased February 5; leaf buds burst February 7; first leaf unfolded 

 February 1 1 ; all leaves withered February 24. 



Ammonium oxalate (strong). — College Park, Maryland: Leaf buds 

 eased February 3; flower buds eased January 29; flower buds burst 

 February 5; flowers open February 7. 



Ammonium oxalate (weak). — Storrs, Connecticut: No response. 



Potassium chloride (strong). — College Park, Maryland: No response. 



Potassium chloride (weak). — 



Storrs, Conn. Lansing, Mich. 



Leaf buds eased February 3. January 30. 



Leaf buds burst February 5. February 1. 



First leaf unfolded February 14. February 14. 



