MEMOIRS OF THE NEW YORK BOTANICAL GARDEN. 



143 



of the leaflets remained folded together, and were thickly furnished 

 with hairs. A large quantity of a reddish coloring matter was noted. 

 The bulbs were healthy and small ; new ones were formed in both 

 species of Oxalis examined. After the production of the first lot of 

 etiolated leaves, growth was confined to the development of runners 

 or offsets. 



Pastinaca sativa L. 

 Parsnips were placed in the dark chamber in January, 1901, and 

 sent up leaves which had reached full size on April 11, 1901. The 

 petiole and its main branches in the leaf showed excessive elonga- 

 tion. The petiole measured 25 cm. from the stem to the first pair 

 of branches, 6 cm. between the first and second pair of branches of 



Fig. 100. Etiolated culture of Pa'^tinaca sativa. 



the petiole, and 3 cm. between the second and third pairs. The 

 distance between the third and fourth pairs amounted to about a 

 centimeter, and the terminal branches were irregularly arranged. 

 The laminae were extremely small and were of a deeper yellow 

 than most etiolated organs. 



It was found that the size of a leaflet, or the length of the petioles 

 might be increased beyond the average of etiolated organs, by cutting 

 away concurrent organs which would compete for the food supply. 

 The laminae were furnished with many perfect stomata, but no starch 



