1909.] NATURAL SCIENCES OF PHILADELPHIA. 73 



meters of water. Weak solution: Five grams in same amount of 

 water. 



Sodium bicarbonate. — StrongT solution : Ten grams in 900 cubic- 

 centimeters of water. Weak solution : Five grams in the same amount 

 of water. 



Potassium bisulphate = Acid sulphate. — Strong solution: Ten grams 

 in 850 cubic centimeters of water. Weak solution : Five grams in the 

 same amount of water. 



Hydrochloric Acid. — Strong solution: Ten cubic centimeters in 

 800 cubic centimeters of water, only one-half of this liquid being used 

 in the experiment. Weak solution: Five cubic centimeters in 800 

 cubic centimeters of water, only one-half of this liquid was used. 



Acetic Acid. — Strong solution: Ten cubic centimeters in 800 cubic 

 centimeters of water, one-half this quantity of liquid was used. Weak 

 solution : Five cubic centimeters in 800 cubic centimeters of water used 

 in one-half the amount of liquid. 



Nitric Acid. — Strong solution: Ten grams used prepared as above. 

 Weak solution: Five grams as above. 



Chromic Acid. — Strong solution: Ten cubic centimeters of four per 

 cent, acid in 500 cubic centimeters of water, one-half of the amount 

 of liquid being used. Weak solution: Five cubic centimeters of four 

 per cent, acid in 500 cubic centimeters of water, liquid used in half 

 amounts. 



Besides the use of chemical solution water controls were instituted, 

 the twigs from each station being placed in a separate jar of water. 

 Thus there were jars for the twigs from the agricultural experiment 

 stations mentioned above. Each of the twigs (some 900 in all) was 

 labelled with a tag on which the locality and the name of the twig- 

 were recorded by a selected abbreviation, thus Pas A 2 indicated that 

 the branch was from an Early Harvest Apple sent from Pennsyl- 

 vania State College, and that NYI W 25 was a twig of the linden 

 (Tilia americana) from Ithaca, New York. The results obtained 

 with the twigs from the northern and southern States in the water 

 and in the various chemical solutions, with the date and the character 

 of the response, may be given as follows: 



Apple (Baldwin). — 



Corrosive sublimate. — Twigs from Geneva, New York, showed no- 

 response in strong corrosive sublimate solution. Twigs from Amherst^ 

 Massachusetts, in weak corrosive sublimate responded on January 31 

 by the easing of the leaf buds; on February 3 the leaf buds had burst; 



