darton.] MARYLAND. 147 
degrees of success. At the cold storage warehouse, 408 West Conway 
street, a well 353 feet deep obtains a large supply of water that answers 
for condensing, and the Maltby House obtains water for closets, etc., 
at a depth of 100 feet. 
At Gail & Ax's building, corner of Charles and Barre streets, a bor- 
ing to 380 feet was made in a mica-gneiss, and at the Globe Brewery, 
two squares northwest, there is a boring to 197 feet, neither of which 
found water. At the Hannis distillery, on Ostend street, near Warner, 
a well was bored over 800 feet into the rock and only a very small 
amount of water obtained, while no water at all was found in a boring 
to a depth of over 500 feet at the Spring Garden Brewery, a couple of 
squares west. Our knowledge of the occurrence of water in the crys- 
talline-rocks about Baltimore is at present too uncertain and too largely 
negative for predictions to be made. 
Region from Brooklyn to Curtis Bay. — The successful group of wells 
at Seawall and at South Baltimore (Curtis Bay) indicates a wide and 
general extension of the Potomac waters under the Curtis Bay-Patapsco 
peninsula. The Seawall water at 217 feet appears to represent the C 
horizon. The 562-foot boring at Seawall no doubt demonstrates the 
absence of water in the basal Potomac, or A horizon, in that vicinity, 
and also in the underlying crystalline rocks. 
Region southeast of Canton to Sparrow Point. — The wells of St. Helena, 
Dundalk, and Sparrow Point are included under this heading. Their 
relations are shown in section 2, PI. V. The wells at St. Helena are 
probably in the C horizon, and the water at 230 feet at Dundalk is 
thought to be in the B horizon, which probably would have been found 
at 200 feet at St. Helena. The 120-foot water at Dundalk I can not 
correlate with any other, but possibly it is the deepest water of Spar- 
row Point. 
The Sparrow Point wells are a most satisfactory group of water pro- 
ducers. The principal supply is obtained from a depth of 125 feet in a 
horizon that is high in the Potomac formation, for a well to 495 feet 
just reached the granite bed rock. In this deep well no water was 
found below 210 feet, which indicates that the lower water horizons do 
not extend far to the eastward in this region. The one well which 
draws 100 gallons a minute from a depth of 210 feet is in a horizon 
which can not be definitely correlated with those to the northwestward. 
Northeastern Baltimore. — Several breweries in this section of the city 
have deep wells, some of which yield satisfactory water supplies. They 
all penetrate the crystalline rocks and obtain water from fissures or 
decomposed portions of these rocks. The water is found mainly at a 
depth of from 300 to 400 feet in the wells near the junction of Belair 
road and North avenue, and the wells are along the northeast-south- 
west strike of the rocks. Probably there is one large vein having a 
width of, approximately, 200 feet, and it may extend along the Belair 
road and Gay street far beyond the present line of wells. At the 
Wiessner brewery the water was found at 300 feet below the surface, and 
