1909.] NATURAL SCIENCES OF PHILADELPHIA. 63 



March 18: Two lateral buds with leaves expanded, most advanced 

 developed in all the solutions. March 20: Some buds fully open, 

 with one or two leaves flattened horizontally. March 25 : No advance. 

 March 28: Majority of twig leaves beginning to unfold. April 1: 

 Leaves were all fully expanded. April 13: Twig dead. 



Ammonium hydrate. — No response until March 15 when one of the 

 lateral buds had burst and leaves were about to unfold. March 18: 

 Leaves nearly unfolded. March 25, March 28: No advance. April 1 : 

 Twigs dead. 



Filtered Water (C). — No response until March 15 when buds were 

 found enlarged. March 18: Buds expanded and leaves flattened out. 

 March 25: Terminal and lateral buds with leaves fully expanded. 

 Rapid growth of this twig continued until April 13 when the experi- 

 ments were concluded. 



Ammonium sulphate. — March 15: Large buds about to open. March 

 18: Leaves pretty well expanded. March 20: One leaf of lateral 

 bud fully expanded, three others almost so. March 25: Leaves of 

 topmost lateral bud nearly expanded. March 28: No advance. 

 April 1 : All of the twigs had gone bad. 



Corrosive Sublimate. — March 15: Buds enlarged. March 18: Buds 

 burst and about to unfold. March 20: Leaves of terminal bud well 

 unfolded. March 25: Some of the leaves expanded. March 28: 

 Buds fully burst, two or three of the leaves were green and flat. April 

 1 : Not much advanced, twig still fresh. April 1 : Leaves fresh and 

 green, broadly expanded. April 13: Twig dead. 



Liriodendron tulipifera. — The chemicals used in the experiments 

 with the tulip poplar were as follows : Five decigrams of sodium chlo- 

 ride dissolved in fifty cubic centimeters of" water; filtered water; 

 five drops of chemically pure sulphuric acid in 100 cubic centimeters 

 of water; five drops of chemically pure hydrochloric acid in fifty cubic 

 centimeters of water; five drops chemically pure nitric acid in fifty 

 cubic centimeters of water; twenty drops chemically pure sulphuric 

 acid dissolved in 100 cubic centimeters of water. 



The twigs did not respond in any of the above-mentioned solutions 

 until March 11, when those in the twenty-drop solution of sulphuric 

 acid and in one bottle of filtered water showed a slight separation of 

 the two outer bud scales. The record for the other twigs is some- 

 what unusual and is here given. 



Sodium chloride. — Absolutely no response. 



Filtered. Water (A). — The twigs did not respond until March 18. 



