EXPERIMENT STATION EEPORT. G31 



^rass patches looked bad, but turned out nothing wov<e than a fo'>r 

 C. territans larvae. A swampy area around the works of the 

 Orange Water Company, caused by an overflow from disused wells., 

 w\as found more dangerous, larvse of Culex territans and pipiens 

 occurring in some numbers, while associated with territans the 

 larva? of Anopheles w'ere also found in such numbers as to indicate 

 that they probably occurred throughout the entire area. 



As this was early for Anopheles, the indications were that later 

 in the season matters would become much worse, especially if rains 

 pro^'ided additional water. The water company had been sensed 

 with a notice to drain the land, but had paid no attention to it, but 

 the discovery of the actual presence of Anopheles larva? so clearly 

 brought the area under the ban of the health laws that a threat 

 from the board to act at the expense of the water company resulted 

 in the immediate improvement of the danger area. 



The worst place found was a ditch almost a mile in length, 

 partly open and in places almost stagnant, into which a large 

 amount of surface water, etc., is drained. East Orange has the 

 separate system <;)f sewers, which receives no surface water, and 

 many cellars and the like are connected Avitli drains that empty 

 intO' this ditch. While it is not, therefore, really an open sewer, it 

 comes very near to it. Along the stagnant and slow-moving areas 

 half-grown larva? of C. pipiens were dipped up in such numbers 

 that each glassful contained hundreds. Adults were plentiful 

 along the margins, and on the surface an average of at least one 

 egg-boat a foot could be seen. It is obvious that this one ditch 

 alone could produce a fair-sized infestation for the entire munici- 

 pality, and the governing body was notified, oil being applied as an 

 immediate remedy for existing conditions. 



This is one of those cases that needs constant watching. At 

 present it seems impossible to^ do without the: ditch ; there is not 

 much fall to the outlet anid stagnation cannot be altogether pre- 

 vented, even with the best looking after. But whenever clogging 

 is permitted by the growth of vegetation or otherwise, ai veritable 

 mosquito mill is established which must receive periodical oil ap- 

 plications to keep it in measurably safe condition. No Anoplieles 

 larva? were found, and perhaps none are apt to develop there. 



Mr. Butterworth informed me that after his notice the city 

 authorities improved matters somewhat, but they could not give 



