I9I0.] 



OX THE DISTRIBUTION OF PLANTS. 



479 



Baccharis halimifolia. Sp. gr. i.oii; temp. 19°. [Sp. gr. 1.0118.] 

 It will be seen by reference to the above observations that even 

 the least typic of the salt marsh species which usually grow subjected 

 to the influence of fresh water are placed occasionally under more 

 trying conditions during exceptionally severe storms, when they are 

 subjected to the action of almost pure sea water. On August 19, 

 1909, the storm having subsided, the normal flow of the tide in and 



Fig. 4. ]\Iap of Shark River and Bay, N. J., showing stations at which 

 hydrometric determinations of the salinity of the water were made. Numbers 

 indicate specific gravities at the points directly under the first figure and the 

 subnumbers indicate the observational stations as noted in the paper and in 

 the original field note-book. 



out of the inlet was reestablished and the following series of obser- 

 vations were then made. 



126. \\'ater from lagoon inside jetty at Shark River Inlet at 

 high tide. Sp. gr. 1.0190; temp. 22)°. [Sp. gr. 1.0210.] 



127. Hole dug 20 cm. deep in an association of Scirpns pniigciis, 

 Solidago sempervircns, Spartina patens, Atriplcx hasfata, Sitaeda 

 inaritima. Water rising from a sandy gravel. Sp. gr. 1.0010; temp. 

 21^ [Sp. gr. 1.0022.] 



130. Water from a hole 46 cm. deep in an association of Jiinciis 



