370 



within reach of the well, and the only remaining question was, 

 could the requisite amount be pumped out without bringing in 

 with it the sand in the bottom and around the well, and thus fill 

 it up. This last question was set at rest by actual observation 

 during a trial of the pump. It was found that when the water 

 in the well was drawn down four and a half feet, water came in at 

 the rate of 850,000 gallons per day, without in the least disturbing 

 the sand in the bottom. This was on the third day the pump was 

 run ; and the rate of flow of the water towards the well will increase 

 as pumping is continued, for the subterraneous channels will arrange 

 themselves in directions towards the well. No doubt the bottom 

 could be brought in, and the well ruined, by suddenly pumping the 

 water down eight or ten feet ; but if it were drawn down even to 

 that depth gradually, no damage would occur. The water must not 

 he drawn down more than four and a half feet suddenly, as it cannot 

 be done safely. 



FORT GREENE. 



The work on Fort Greene has been steadily pressed during the 

 season, and a large proportion of it is completed. The walks laid 

 last year are in good order, and a large amount in addition have 

 been laid this season. Mr. T. P. Kinsley remained in charge of the 

 work, as engineer, until it was suspended in November. Mr. F. Mol- 

 lard performed the duties of general foreman during the continuance 

 of the work. 



On Prospect Park, the organization of the Engineer Department 

 remained essentially as at the last report, during the season, until 

 the suspension of work in November, when the Engineer corps was 

 reduced to correspond with the reduction of the labor force. For 

 the park statistics you are respectfully referred to the reports of the 

 assistant engineers-in-charge, herewith presented. 



The assistant engineers-in-charge, Mr. John Bogart and Mr. John 

 Y. Culyer, have performed the duties of their respective departments 

 with skill and fidelity. 



.Eespectfully submitted, 



C. C. MARTIN, 



Engineer in Charge. 



