48o AGRICULTURAL EXPERIMENT STATION. 



Citlex sylvestris does not breed in these grassy places ; but the 

 situation is ideal for Ciilcx tcrritans and Anopheles, and these 

 two, after their first appearance in the year breed almost contin- 

 ually up to the end of the season. Adults are very rare in these 

 places in the daytime, Ciilex sollicitans being sometimes taken ; 

 but that is the only mosquito that seems to love the sunshine. 



The Great Piece Meadow has many large, woodland tracts and 

 large grassy areas; the Platfield Swamp and Long Meadow are 

 mainly grassy with small patches of woodland, while the Troy 

 and Black Meadow^s have no woodland at all, but are much like 

 the Hackensack Meadow, overgrown with cat-tails, tussocks, 

 water lilies and arrow leaf, and are too frequently covered with 

 water to allow moscjuito breeding. 



d. The TRENTON PROBLEM. 



At the request of the Trenton Board of Health I spent part of 

 a day with some of the members, driving through those parts of 

 the city and its immediate environs where mosquito breeding 

 areas were supposed to occur. After this preliminarv survey I 

 visited the city several times during the season and detailed Mr, 

 Grossbeck to make a systematic examination of the city itself 

 and of its surroundings, following the Delaware, south to Bor- 

 dentown. 



In a general way it may be said that the creeks and canals that 

 run through the city are not dangerous as mosquito breeders 

 within the limits of their banks or natural beds. But along the 

 Assunpink Creek there are a few places within the city limits 

 where in times of high water the banks are flooded and nasty, 

 large pools are left when the water recedes. In these, mosquito 

 larv^se were found in abundance and at State Street and Lincoln 

 Avenue along the creek, areas were found literallv swarming 

 with them. These overflowed areas should be either filled in or 

 provided with an outlet so that all the water might drain into the 

 creek as it receded. 



At several points along the Delaware and Raritan Canal, seep- 

 age through the banks forms pools that -were found full of mo- 

 squito larvae — not Ciilex alone, but Anopheles or malaria carriers 

 as well. In almost every instance these places could be filled 

 with little difficulty with ashes or factory waste. The continued 

 presence of such places means only a failure to realize their dan- 

 gerous character. 



One of the least creditable areas in the city lies almost directly 

 back of the State Capital, between it and the river. This is a 



