472 



HARSHBERGER— INFLUENCE OF SEA WATER [April 22, 



of the varying salinity of the water upon the plants which are sub- 

 jected to the dilTerent densities of salt water. For this purpose, I 

 have chosen Typha angustifolia because it seems to show in a marked 

 degree the influence of the variation in the saline environment. Six 

 series of measurements were taken at this plant. Three series are 

 based on plants from Stockton Lake and three upon plants from 

 Pleasure Bay. 



In all the measurements the height of the plant is measured to 

 the top of the fertile part of the terminal spike. The upper sterile 

 and staminate portion is included, but it is only temporarily present. 

 Measurements are metric. 



First Series. Typha oiigustifolia from Stockton Lake Shore. (Position 



L) Sp. gr. 1.0145. 



Series of heights: .922, .929, 1.008, 1.015, 1.030, i.ioo, 1.119, 1.124, 1.353- 

 Arithmetic mean ^ 1.066. 



Length of spikes, $: .075, .076, .080, .082, .087, .090, .098, .124. Arithmetic 

 mean =: .089. 



Breadth of spikes, ?: .016, .018, .019, .020, .022. Arithmetic mean =: .019 



Second Series. Typha angustifolia from Stockton Lake Shore. (Position 



II.) Sp. gr. 1. 014. 



