228 



BOTANICAL GAZETTE 



[APRIL 



was recorded. This relation was not wholly unexpected, as high 

 temperatures and low relative humidities had been found to occur here 

 during the preceding summer; 

 large. Preceding the second at 



but the amount of the excess seemed 



measurm 



mstruments were brought to the garden and exposed side by side for 

 four days. Their individual factors were recalculated and found to be 

 practicaUy the same as those calculated by Livingston. Further, 



Station 12 at tirilft"' ^""""^ ^"^^ """"^^ ^^^ "^^^ '^''^^' ^^^^^""^ " i° ^^^ distance; 



instrument 



cle ^^^.^''^P^'"^*^^^ °^'er the salt marsh may be accounted for is not 



vPaJt .• '''JS^'^^^°^ is offered that the deposition of salt on the 



e etat^on is effective in reducing the vapor tension of the overlying 



stratum of air suffirfpntT,. f^ .„:,. .i_. .__ ,. 



Station 



poration 



i^.—Inner end of salt marsh, on \he tension IJne between 



^Pamna patem-Juncu, Gerardi association and the Scirp 



cana association (fig 



^thou^ the tide occasionallv invades this 



