458 



HARSHBERGER— INFLUENCE OF SEA WATER [April 22, 



in phytogeographic and phytoecologic investigation. The method is 

 appHcable not only to a study of salt marsh soils, but also to an 

 investigation of salt lakes and alkaline soils, which are found in 

 many parts of our western arid districts and in other parts of the 

 world (Fig. i). The use of the hydrometer supplements, if it does 



JyphA aogustlfpllA. 

 . Pi>Jch»a.e.antphocala. 



OpaajiW«.ter> Belmar. 



.At/JDlex.baataifl 



.El Ma^J t prr^jie an. . . . 

 Snsrlina_«tclcta-Diacii.. 



&■ S^Ucornia herbacea 



Temperature 

 SaJ! M.ar%h.ManasQi/an. 



, XympKaaa odoxAU 



'•?25 Ju.ncu^Ger^d,.. 

 I^^^---D.,.ichl,s,picau 



1.035 



I-P?9.Bi>ierLak<>jSiberia 



1.046 



050 



S(ULL«l<iB.Shi.ra,i. 



_,, Persia 



Sal.t.Marth, Belntar 



. aumroec Tewo, Saa. 



VVater.Belmar 



11.1083 SallLake.Utah 

 l5.2^«Sallne 



Fig. I. Special hydrometer and thermometer used in the investigation 

 of the salt marsh vegetation of the New Jersey coast. The names of plants 

 are arranged along the scale to graphically represent the maximum density of 

 salt water to which these plants are subjected in their marsh environment. 

 Other data are given for comparison. 



not replace, the employment of the more expensive and cumbersome 

 apparatus which determines by electric means the salt content of 

 soils. Althouijh this investigation was made in the salt marshes of 



