FLORA OF McNAB's ISLAND, HALIFAX, N. S. BARBOUR. 565 



Unoclca sensibilts. — Fronds droupcd in ten minutes. Pinmu 

 curled back. 



Clinjsdntliofiiiffi Iciicinithonnni . — Specimens dry. Heads 

 began to droop in twenty minutes, when the root is present. 

 Heads without root drooped and closed, leaves darkened and 

 became limp in. eight minutes. 



Head with roots present, roots in lethal chamber completely, 

 but head and leaves outside chamber in fresh air. Little 

 affected. Leaves became slightly discolored, and flower just 

 began to close in two houre. 



Cornus canadensis. — Specimens dry. Very resistant. No 

 effects in one hour. In one and a-lialf hours leaves just began 

 to turn yellowish. In two hours quite yellow. These flowers 

 sometimes transpire slightly under the influence of narcotic. 



Trifolium pratense. — Specimens dry. Leaves affected in 

 ten miiiutes, becoming nearly black, and limp. Tlie flowers 

 changed to purple from red in 28 minutes. Scent disappeared 

 first and early, in live minutes. Changes completed in one hour. 



Prunella vulgaris. — Specimens dry. Very rapidly affected. 

 Flowers turned brown and became limp in five mi'nutes or less. 

 Leaves darkened. Results same, whether roots were present or 

 not. 



7m versicolor. — Specimens dry. Flowers drooped in 15 

 minutes. Transpired slightly. 



Sedum acris. — Affected in five minutes. 



Sarracen.ia purpurea. — Specimens slightly moist and wet. 

 Flowers affected in fifteen minutes, drooping. Discoloration 

 slight. Leaves not affected for a longer time. 



Ranunculus acris. — Specimens dry. Heads drooped and 

 became a darker yellow in twenty minutes ; leaves changed to a 

 deep olive colour, and became limp in ten minutes. In speci- 

 mens in which the roots were in lethal chamber and heads in 

 fresh air, leaves closed in ten minutes, but were not discolored. 

 The flowers were unaffected for a, long time. 



