New-York tribune., 1871-01-21

contains large quantities Of chloride OF calcium and
magnesium There is through the valley OF shratogaa
many hundred feet is n porous layer OF sandstone.
This 10 the surface further north, WhoIe & a. ro
through the sandstone dsoves the saline matter takes
up the carbonic acid, and comes up through 'nc c'"
PURIFICATIoS.
Where water Is used for washing, rs In wooeh mills III
dyeing &c. it iseXtremely important that shouu oo
comparatively pure. Various methods have
TO for its purhcation THE speaker here exhDl'eu
filter. which he said coming INTO use
IN which sponge Is made to 40 o,dcI sG is oiWnvs
the best. Wells Objectionable, they serve 70 COZ
lec what soaks from the SOIL aud In these waters htIt
acid and dccOmpOsed animal substances are alnioss
always found 1t is found that the waters m Oh
artesian wells contain no oxygen TO irSt imaSf
into contact with the air. River and lake waters are
preferable for city supplies As to the characterses vi
90 degrees it should he free from taste except
perhaps, slight saline taste, and slight pun
parency is not important, water may he
considerably coored and yet be free from injurious III
the quality Five or Fix grains OF lime magnesa in
water renders it unit for cooking. For tea
and coffee however, it is found TO be an advantage
TO have ia small quantity of lime IN the water;
person Of delicate taste can detect the presence OF
lime salts in water when II exists IN the proportion Oh
only two grains to the gallon Certain waters In almost
eSGry region acquire special th as famous @
pomps one of which was situated in franklinst where
hGy was kcp, % corer nor te or Rcade and Cen
trcsts.
ORGANIC IMPURITIES.
1t is the organic matter in water which Is objectionable,
not the vegetable. In many living vegetables are
great safeguards Many lives have been saved by
the action Of vegetation destroying decomposng animal
substances. Soakage from the neiGhbQring dwellings
adds organic matter to the water, which has germs or
disease. Analysis hardly detects it, Sudden outbreaks
of dysentery produced by this cause. Before
New-York was supplied with Crot0n water, 1t
was visited by cpidemcs believed to have been caused
by deGlcmcnt OF the wells then muse Cholera, although
il does originate from this cause Is chiefly dissel
mated By impure supplies of water During times OF its
prevalence il has noticed that where fresh water is
abundant no deaths of any consequence occur.
The evil which most likely 10 suffer y from
nprc gnation OF the water from lead There hardly
distilled water attacks it rapidly; water containing
lime salts attack 1t less rapidly. Nhch
Croton water was first introduced owing to
the aqueducts being freshly built the water
much impure than at present aud 1t was then
noticed that had but little effect upon lead but as the
water becomes purer We are in more danger OF It's
contamination. Several other materials nave
been suggested substitute IOr ledu
pipe. The objection to galvanized iron Is
that il is less easily introduced and that water, IN these
pipes is sometimes contaminated with oxide OF lr0n
This not injurious but disagreeable. Glass pipe has
been suggested but the Inconvenience Of introducing
is serious objection. The best pipe that am familiar
with made of tin surrounded with Lead the water
being entirely protected from the lead