darton.] DISTRICT OF COLUMBIA. 159 
The supply is stated to be 100,000 gallons a day. The following record 
was given : 
Feet. 
0-15 gravel. 
15-20 coarse gravel and bowlders. 
20-150 alternating layers of sand and clay with some water. 
150-159 coarse gravel, containing water. 
159-225 crystalline rocks. 
Reform School. — This well is on the high hill just south of Rives Sta- 
tion. It was bored on a prediction which I made that waters could be 
found at about 200 and 400 feet, respectively, below the engine house, 
which is at an altitude of about 170 feet. The upper water was found 
at 270 feet in large supply and of excellent character, although slight! v 
chalybeate. Samples of the borings were kindly sent to me by the 
board of trustees. They afford the basis for the following record: 
Feet. 
0-4 light reddish-brown clay. 
4-21 buff and white variegated clay. 
21-30 reddish- buff clay. 
30-42 .buff sand, moderately coarse, in clay matrix. 
42-59 reddish-brown clay. 
59-72 brown-red sandy clay. 
72-77 fine buff sand. 
77-80 red, white, and buff variegated clay. 
80-101 arkosic sand with clay and quartz pebbles ; light color. 
101-105 reddish-gray clay. 
105-113 coarse light-brown sand, gray clay pebbles. 
113-125 gray clay with sand and pebbles. 
125-130 brownish-buff clay. 
130-149 red clay with " paint" streak. 
149-165 gray, very sandy, micaceous clay. 
165-173 dark- gray heavy clay. 
173-180 coarse gray sand, some clay as matrix. 
180-191 gray clay with lignite and some sand. 
191 lignite in sandy clay. 
192-198 lignite, iron pyrites, and siderite. 
198-213 no sample. 
213-214 quartz pebbles, one-half to three-fourths inch. 
214-217 coarse, gray sand, somewhat arkosic. 
217-240 sands (no samples). 
240-250 moderately coarse, gray sand with pyrites. 
250-259 gray sand with quartz pebbles. 
Palais Royal. — The following record is given for the Palais Royal 
well, at Eleventh and G streets NW. 
Feet. 
0-5 surface material. 
5-10 sand and gravel. 
10-20 clay with thin beds of water-bearing sand. 
20-40 sand and gravel. 
40-80 ? 
80-97 gravel with water in large supply. 
