Page 275 - 1915, Springs of CA.

SULPHUR SPRINGS. 255

sulphureted water, which supplied the bathhouse below it. The
central spring was formerly used as a bathing pool, but it had become
filled with mud and grown with tules. The two southern springs
filled slightly used brick drinking basins. The southernmost spring
appeared to be the largest of the five, as a stream of about 4 gallons
a minute, which apparently came from it, issued at the creek edge a
few yards away. A temperature of 83° was recorded at this spring.
The water of the other springs is also noticeably warm, so the
springs are marked on Plate III (in pocket) as thermal sulphur, but
they are best known as sulphur springs.
The analyses on page 254 show that the waters are essentially
primary saline. The presence of sulphide sulphur is of interest, as
this form of sulphur is considered to be the most efficient medicinally.
The springs issue from crushed sandstone of the Franciscan forma-
tion,1 which forms the hills of the locality.
NAPA VICHY SPRING (NAPA 13).
A small spring, whose water is moderately sulphureted, issues about
3 miles east of north from Napa, on low slopes of tuff aceous lava that
border the valley. The water rises in a cemented basin within a cir-
cular, latticed spring house. It is piped directly to a bottling house
near by, where it is carbonated and bottled in siphons for local sale.
It has been on the market since about 1898 as Napa Vichy Water.

VALLEJO WHITE SULPHUR SPRING (SOLANO 2).
Vallejo White Sulphur Spring is situated in the hills 4 miles north
of east from Vallejo. The property has been conducted as a resort
for a number of years, the improvements in 1909 including a hotel,
several cottages, and a small artificial lake.
The spring rises in a shallow pool about 12 feet in diameter, at the
base of a steep, craggy slope of siliceous rock that has been mapped
as being a portion of the Franciscan formation.1 The water is dis-
tinctly sulphureted, but is not otherwise noticeably mineralized. A
partial analysis, published in advertising matter, indicates that sodium
and magnesium are the two principal constituents and that they are
present in the ratio of 1 to 1.6. It is rather warm for drinking, as its
temperature is 68°, but it is heated for bathing. It has also been
bottled to some extent and marketed locally for table use.

EL TORO SPRING (MARIN 1).
Mildly sulphureted water issues at El Toro Spring on the eastern
side of a basaltic hill 2^ miles northwest of Novato. This water was
formerly bottled and sold for table use, but for a number of years it

i Weaver, Charles, U. S. Geol. Survey Geol. Atlas, Napa folio (unpublished).