76 PROCEEDINGS OF THE ACADEMY OF [Feb., 



strong corrosive sublimate solution responded on February 5 with the 

 easing of the buds ; on February 7 the leaf buds had burst ; on February 

 11 the first leaf had unfolded, while on February 14 all of the leaves 

 had expanded. The leaves had all withered by February 21. In 

 weak solution the buds of the twigs from Auburn, Alabama, had eased 

 on January 31 ; on February 4 the leaf buds had burst, and on February 

 11 the first leaf had unfolded. 



Copper sulphate. — The twigs from College Park, Maryland, in strong- 

 solution showed response on February 1 when the leaf and flower buds 

 had eased; on February 4 the flower buds had burst. No other re- 

 sponse followed. The twigs from Pennsylvania State College responded 

 on February 18, seventeen days later than those from Maryland, but 

 the buds remained closed without bursting. In weak solution the 

 twigs from Auburn, Alabama, responded February 1 by the easing of 

 the flower buds and leaf buds on February 5, and by February 15 

 the first leaf had unfolded. No other response. 



Sodium chloride. — The buds on twigs from College Park, Maryland, 

 in strong solution responded slightly on February 5 without any 

 advance. 



Ammonium nitrate. — The twigs from College Park, Maryland, in 

 weak solution responded on February 1 by the easing of the buds. 

 No other response. 



Ammonium oxalate. — Twigs from College Park, Maryland, and Geneva, 

 New York, in strong solutions of this chemical made no response. In 

 a weak solution the twigs from Auburn, Alabama, responded by the 

 bursting of the leaf buds on February 14 and by the expansion of the 

 first leaf on February 15. 



Potassium chloride. — In strong solutions the branches from College 

 Park, Maryland, and Geneva, New York, made no response. 



Sodium bicarbonate. — The twigs from College Park, Maryland, made 

 no response in strong solution. 



Potassium bisulphate. — Twigs from Pennsylvania State College 

 made no response in strong solution, neither did those from Auburn, 

 Alabama, in weak chemical. 



Acetic Acid. — The twigs from Auburn, Alabama, in weak acid showed 

 no change and eventually died. 



Nitric Acid. — The buds on twigs from Auburn, Alabama, showed 

 a slight response in weak acicl by the easing of the buds. Eventually 

 the twig died. 



Chromic Acid. — The specimens from Auburn, Alabama, in weak 

 acid made no re^pnn^e. 



