jdne, 1907.3 ASO.— ACTION OF NAPHTHALENE ON PLANTS. 



Ill 



a stimulation of barley, but not of pea while 5 grams naph- 

 thalene per pot caused injury in every case. The plants 

 were harvested and weighed in the airdry state : 



Barley, 9 plants per pot. 



Number 

 Naphthalene. of 

 stalks. 



Weight 



of 



ears. 



Weight 



of 

 straw. 



Weight 



of 

 grains. 



Total 



1 



f 28 



44.8 



g- 



34.0 



g- 



37.0 



g- 



78.8 



{ 27 



44.9 



31.0 



37.5 



75.9 



5 



17 



39.0 



22.9 



32.7 



61.9 



Check 



pot. 19 



41.0 



22.0 



34.5 



63.0 



Naphthelene. 



Pea, 10 plants per pot. 



{ 



Check pot. 



Number 



of 



pods. 



49 

 52 

 36 

 59 



Weight 



of 



pods. 



g- 



24.0 

 24.9 

 18.4 

 27.0 



Weight 



of 



seeds. 



g- 



21.1 



21.8 

 17.0 

 23.3 



Weight 



of 



straw. 



g- 



11.5 



11.0 



6.2 



15.9 



Total, 

 g- 



35.5 

 35.9 

 24.6 

 42.0 



Experiment with Buckwheat and Millet. 



In this experiment, two series were observed under essenti- 

 ally the same condition, as with barley. 



The quantities of napthalene were 5g., lg. and 0.5.g per 

 pot. The harvest was weighed in the airdry state with the 

 following result : 



Naphthalene. 



Weight 



of 

 fruits. 



Weight 



of 

 stalks. 



0.5 



g- 



f 46.0 

 i 52.9 



g- 



32.0 

 17.5 



Total. 



•148 



