102 



PROCEEDINGS OF THE ACADEMY OF 



[Feb., 



northern localities responded much more quickly than did those from 

 southern localities. Thus in water the leaf buds of the Red Astrachan 

 apple from Storrs, Connecticut, burst on February 4; those from 

 Lansing, Michigan, on February 6, and those from Auburn, Alabama, 

 on February 11 — a difference of a week between the more northern 

 and the more southern localities. The leaf buds of the York Imperial 

 apple burst in water on January 31 from Geneva, New York; 5 February 

 3 from Amherst, Massachusetts; February 4 from Storrs, Connecticut; 

 February 11 from College Park, Maryland, and February 15 from 

 Auburn, Alabama. A reference to the experimental data will show 

 practically the same sequence throughout, the buds on northern grown 

 twigs always opening before those on southern grown ones. The 

 sequence of the bud development in the chemical solutions proceeded 

 as above indicated for the twigs in water. The buds on twigs of the 

 same species, where comparison is possible, from northern localities 

 opened first in the same chemical and those of southern localities 

 followed as indicated below; 



Weak Corrosive sublimate (Kieffer Pear). — 



Storrs, Conn. 



Leaf buds eased February 4. 



Leaf buds burst February 7. 



Weak Copper sulphate (Maiden Blush Apple).— 



Lansing, Mich. 



Leaf buds eased 



Leaf buds burst February 1. 



Weak Sodium chloride (York Imperial Apple). — 



Amherst, Mass. 



Leaf buds eased January 31. 



Leaf buds burst February 4. 



First leaf unfolded February 5. 



Strong Ammonium nitrate (Kieffer Pear). — 



Lafayette, Ind. 



Leaf buds eased January 30. 



Leaf buds burst January 31. 



First leaf unfolded February 4. 



Lafayette, Ind. 



January 31. 

 February 3. 



Auburn, Ala. 

 February 7. 

 February 8. 



Storrs, Conn. 

 February 4. 

 February 5. 



February 7. 



Auburn, Ala. 



January 31. 

 February 4. 

 February 7. 



5 Geneva, New York, although geographically south of Amherst, Massachu- 

 setts, is probably climatically more northern. 



