I9I0.] ON THE DISTRIBUTION OF PLANTS. 491 



27, 1909, and this excerpt shows the bearing of this study upon the 

 Delaware River fisheries. I quote in full : 



Millions of crabs are moving up the Delaware River from the sea. Their 

 coming is due to the protracted drought, which has reduced the downward 

 strength of the current in the river and caused the saline waters of the 

 Atlantic to reach the harbor of Philadelphia. For the first time in many 

 years the Delaware River is brackish as far as Gloucester, the result of which 

 is that mullet, sea bass and porpoises may be seen every day above Chestei. 

 The crabs which are the kind generally caught off the coast are to be 

 found everywhere from the Delaware Breakwater to Philadelphia. For the 

 first time on record, a big catch was made yesterday off the Point House 

 piers, below Greenwich Point in the lower section of the city. Oldmans 

 Creek, Raccoon Creek on the New Jersey side of the river and other tribu- 

 taries of the river are alive with fish and crabs, and every day fishermen are 

 bringing to market big hauls made in sight of Dock Street market. 



Boilers on river steamboats have to be watched carefully, as the salt in 

 the water causes constant foaming and more than ordinary diligence is re- 

 quired by marine engineers to prevent serious results to vessels for which 

 they are responsible. 



In the latter case the use of an hydrometer, or salinometer would 

 indicate the dilution at which the foaming in the boilers no longer 

 took place and thus its use in such emergencies of navigation becomes 

 of great importance. 



In the following bibiliography not all of the papers cited deal 

 directly with salt marshes, but they treat of the influence of saline 

 solutions in general upon animals and plants. In this list will be 

 found many important papers which represent the most modern 

 expression of opinion upon the accommodation of organisms to vary- 

 ing degrees of saline concentration. 



BIBLIOGRAPHY. 

 Bartlett, H. H. 

 1909. Submarine Bog at Woods Hole. R/iodora. XL : 221-238. December, 



1909. 

 1911. Botanical Evidence of Coastal Subsidence. Science. N. S., XXXIII.: 



-9-31. January 6, 191 1. 



Cannon, W. A. 



1908. On the Electric Resistance of Solutions of Salt Plants and Solutions 

 of Alkali Soils. The Plant World, XL : 10-14, January, 1908. 



Casu, A. 



1907. Contribuzione alio studio della flora delle saline di Cagliari Parte III 



Resistenza fisiologica della flora delle saline all" azione del sale marino. 



Aniiali di Botanica, V.: 273-354 (iQO/). Review in Botanical Gazette, 



XLIV. : 234, September, 1907. 



