474 



HARSHBERGER— INFLUENCE OF SEA WATER [April 22, 



The next three series of Typlia angustifolia were collected along 

 the shores of Pleasure Bay under somewhat similar conditions to 

 those along the shores of Stockton Lake. 



Fourth Series. Typha angustifolia in Salt ]^Iarsh. Sp. gr. 1.015. 



Series of heights: .768, .788, .857, .888, .904. .910, .925, .962, .980, 1.005. 

 Arithmetic mean =; .898. 



Length of spikes, $: .096, .100, .110, .119, .120, .130, .135, .209. Arithmetic 

 mean := .127. 



Breadth of spil<es, ? : .005, .006, .007, .009, .010. Arithmetic mean = .007. 



Fifth Series. Typha angustifolia near Middle Part of Upper Pleasure 



Bay. Sp. gr. 1.005. 



Series of heights: .833, .877, .879, .910, .932. 1.030, 1.096, 1.102, 1.130, 

 1. 180. Arithmetic mean = .996. 



Length of spikes, ?: .081, .087, .0S9. .090, .102, .112, .114. .115, .128, .133. 

 Arithmetic mean = .105. 



Breadth of spikes, $: .007, .009, .010, .011, .012, .013. .014, .015. Arith- 

 metic mean ^ .011. 



Measurements include sterile and staininate part of the spike. 



