486 



HARSHBERGER— INFLUENCE OF SEA WATER [April 22, 



Sequence of Salt Marsh Plants Arranged According to 

 [Maximum Density of Salt Water. 



In order to make what follows more general and intelligible, the 

 specific gravity of saline solutions at 15° C. and the corresponding 

 percentages of sodium chloride in solution is displayed in the fol- 

 lowing table for converting specific gravities of salt solutions into 

 per cent, of sodium chloride taken from Landolt-Bornstein, " Physi- 

 kalisch-Chemische Tabellen," p. '^22. 



Now, if we place the salt marsh plants according to their ability 

 to withstand degrees of salinity of water, we can appreciate better 

 the factors which control their distribution in the bays and estuaries 

 of the New Jersey coast. The first figures show the greatest degree 

 of salinity to which the various species are subjected and the second 

 number indicates the limit toward the fresh water end of the series. 

 The range varies in the difit'erent species to a marked extent. 



Spart'ma stricia uiaritiiiia 1.02996-1.00140 



Spartina patens i. 02996-1. 00220 



Salicornla licrbacca i. 02996-1. 00240 



Distichlis spicata i .02780-1 .00750 



Limonium caroHnianum 1.02 780-1. 01 940 



J uncus Gcrardi i .02670-1. on 70 



Baccharis haliuiifolia 1.02520- 



Astcr tciiuifoliiis 1.02520- 



A triplex hastata 1.02520- 1.00220 



Ocean water, Belmar 1.02240- 



'^I'allisneria spiralis i. 01 930-1. 00000 



Scirpus pungciis i.oi 910- 1. 00000 



*Peltandra virginica 1.01910-1. 00000 



*Phragmites communis i. 01 530-1 .00160 



^Hibiscus moscheiitos i.o 11 80- 1.00500 



Pluchea camphorata 1.00650- 



Xymphcca odorata i. 00440- i.oooco 



Spartina polystachya 1.00240-1.00050 



