1909.] NATURAL SCIENCES OF PHILADELPHIA. 77 



Water. — The Early Harvest apple twigs from Pennsylvania State 

 College made a slight response by the easing of the buds on January 

 31. Those from Maryland burst their flower buds on February 4 

 and their leaf buds on February 14. The twigs from Geneva, New 

 York, showed a more steady course of development. On February 4 

 the buds had eased; on February 5 the buds had burst; on February 

 11 the first leaf had expanded, and on February 24 all of the leaves had 

 unfolded, some of which remained green until March 14. The only 

 responses of the twigs from Alabama were on January 29 when the 

 flower buds had eased, and on February 18 when the leaf buds had 

 burst. 



Apple (Maiden Blush). — 



Corrosive sublimate. — In weak solution the twigs from Storrs, Con- 

 necticut, responded on February 4 when the leaf buds showed signs 

 of swelling. On February 5 the leaf buds had burst and on February 

 7 the first leaf had unfolded. The twigs from Lafa3 r ette, Indiana, re- 

 sponded on February 4 and on February 7 the leaf buds had burst. 



Copper sulphate. — The twigs from Lansing, Michigan, burst their 

 buds on February 1 without other response. 



Sodium chloride. — The buds on twigs from Storrs, Connecticut, 

 responded on February 7 without other change. Those on twigs from 

 Lafayette, Indiana, burst on February 14, with the expansion of the 

 first leaf on February 15. 



Ammonium nitrate. — In strong solutions of this chemical the leaf 

 buds burst on February 3 ; the first leaf unfolded February 4, and the 

 first flower bud burst on February 1 on twigs from Lansing, Michigan. 

 The only response of twigs from Lafayette, Indiana, was on January 

 31 when the leaf buds burst. 



Ammonium oxalate. — The buds on twigs from College Park, Maryland, 

 responded on February 5, and on February 7 the first leaf bud had burst 

 in strong solution. In weak solution the Connecticut twigs made no 

 response. Those from Lafayette, Indiana, responded by the easing 

 of the buds on January 31; bud bursting on February 3 and leaf 

 unfolding February 11. 



Potassium chloride. — No response in strong solution. The Storrs, 

 Connecticut, twigs in weak solution responded on February 3 and the 

 leaf buds burst on February 5. The buds of the Lafayette, Indiana, 

 twigs responded January 29 and had burst by February 1. 



Sodium bicarbonate. — The twigs in a weak solution of this chemical 

 responded on February 5, but after that date they were at a standstill. 

 The twigs from Indiana and Alabama made no response. 



