igio.] 



ON THE DISTRIBUTION OF PLANTS. 



483 



River Bay with J^iUisncvia spiralis abundant. Sp. gr. 1.0165 ; temp. 

 26°. [Sp. gr. 1.0193.] 



120. Hole dug in a marsh at base of a ckmip of Peltandra znr- 

 ginica. Sp. gr. 1.016; temp. 27°. [Sp. gr. 1.0191.] 



124. Water from a marsh lagoon at base of a steep bkiff sub- 



Fig. 7. Clump of Paiiicum inrgatum growing along shore of Stockton 

 Lake controlled by fresh water. 



jected to evaporation between the daily tides. Lagoon surrounded 

 by Spartina stricta maritima. Sp. gr. 1.0155; temp. 29°. [Sp. gr. 

 1. 0192.] 



The above observations give the geographic data upon which the 

 study of the distribution of the salt marsh species has been based. 

 It will be seen that proceeding from the ocean up the various bays 

 and inlets there is a general decrease in the saltiness of the controlling 

 water as revealed bv the use of the hvdrometer and the amount of 



