15 



As I stated last year, some idea of the vastness of the work 

 of mosquito extermination, even in the northeast corner of New 

 Jerse}^ alone, may be grasped when it is realized that the com- 

 bined salt-marsh area of these five counties is two and one-half 

 times larger than Manhattan Island. To the west of Newark 

 Bay is shown a portion of meadow lying partly in Essex and 

 partly in Union Counties. 



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1 PORT NEWARK 1 







Fig. g. — Diagram of salt-marsh areas of Essex and Union, showing dikes 



and tide-gates. 



This map shows this portion of meadow in Essex and Union 

 Counties on a larger scale, and indicates the location of three 

 areas protected from the high tides by dikes and tide-gates. This 

 map shows only the location of the dikes and the outlets to 

 tidewater, but does not show the ditching of the meadow 

 surface. 



The next illustration will be a map on a larger scale of a 

 part of this meadow lying in Essex County and west of the 

 Central Railroad of New Jersey (fig. lo). 



This shows the ditching in a portion of the Essex County 

 meadow as it actually exists, made from a very careful survey. 

 The Central Railroad of New Jersey runs along the east, the 

 county line on the south, and the upland forms the balance 



