604 
GEOLOGY OF THE FIRST DISTRICT. 
15. Well at the corner of Houston and Lewis streets, reached rock at ninety-four feet. 
16. Corner of Avenue D and Houston-street, reached the rock at ninety-six feet. 
17. Corner 7th-street and Lewis, reached the rock at ninety-three feet. 
18. Corner of 7th-street and Avenue D, reached the rock at one hundred feet, 
19. College place, reached the rock at eighty feet; all sand. 
20. At Fulton market, one hundred and thirty feet. 
21. Centre-street, Halls of Justice,^ forty feet filling in, thirty feet very soft black mud, 
then thirty feet blue clay. 
22. Foot of Jeffers on-street and East river, reached the rock at fifty feet; ten- feet drift, 
and forty sand and clay. 
23. Bored seventy feet to hard gravel at Williamsburgh, but without reaching the rock.* 
228th-street is the northernmost street on the island. Twenty streets make one mile. The 
breadth is from half a mile to two miles and a quarter. 
* Most of the above facts, on wells and borings, are furnished by Mr. John Disbrow, 136 Bowery. 
