148 ARTESIAN WELLS ON THE ATLANTIC COAST. [bull. 138. 
in fair supply, but when wells were sunk to 315 and 400 feet at the 
Bauernschmidt brewery, a block southwest, the supply at once dimin- 
ished to a very small amount. The well at the Brehm brewery, which 
is some distance east of the Belair road, and several squares beyond 
North avenue, was sunk in the rock to a depth of 1,300 feet without 
finding water, but it is considerably east of the line of the other wells. 
The Darley Park Brewery well, on the Harford road, three squares 
north of North avenue, is west of the Belair-Gay street line of wells. 
The waters from these wells differ considerably in character, but in 
greater part they are satisfactory for boilers and drinking. An analysis 
of the water of a well at Von Der Horst's brewery is as follows : 
Analysis of water from well at Yon der Horst's breivery. 
Sodium chloride 
Sulphate of lime 
Carbonate of lime 
Carbonate of magnesia. 
Total 
Grains 
per 
gallon. 
3.25 
1.33 
8.44 
3.55 
16.57 
The water from the wells at the Standard brewery is too ferruginous 
for general use. 
Western part of Baltimore. — Excepting the well at the Lipp Soap 
Works, at Holla ad and Oalverton streets, I have no specific data for 
borings in the western part of Baltimore. The soap works wells are 
in crystalline rocks, and reached a vein or fissure which yields a good 
supply or water of excellent quality. 
THE WATER HORIZONS OF MARYLAND. 
It is now satisfactorily established that the entire Coastal Plain 
region of eastern Maryland is underlain by subterranean waters, and 
that there are several horizons of water-bearing beds under the greater 
part of the area. On the map in PI. V, and in the cross sections of 
PI. VI, the distribution of wells and water horizons is represented, 
and it will not be necessary to supplement these illustrations with an 
extended discussion. 
The water horizons in the gravels and sands of the basal beds of the 
Potomac formation, which lie on or near the floor of crystalline rocks, 
are the principal source from which waters are to be expected in the 
western portion of the area. How far southeastward this water horizon 
may extend has not been determined, but probably it will yield water 
in many areas nearly to the shores of the ocean. This last considera- 
tion is, however, not particularly important, for to the east and south 
the dip of the Potomac horizon carries it to a great depth, and there 
J See also under Baltimore, pp. 13J-148. 
