Evening star. [volume] (Washington, D.C.) 1854-1972, 1907-03-20

.,o r,ter supplies of the dairy farms
| viii he dealt with here. and aithousn :.
| imnossble to determine accurately tne go,
| dition of the milk when Is sen. ,fntton Of
! n dairy farm by the relative poHutlon y.
the water supply of that same IdIn
| NAV fairly be classed as an in1eIen.la.
| method of diagnosing the probable oah N.
of similar pollution occurring ~, M ,, sin only
| II is possible of course, that py usins oiily
! hot water for rinsing cans ana pottieS, VI
| even by thorough pasteurlzation, INN ,,o
an exceedingly high purity couiu pe
trihuted from farm the water supply y.
n'ot uas badly contaminated. but as
Prof sedgwick says in his principles oa
anif.ry science The fact appears 10 oe
that the dairy industry Is, as a ,uie' &C.
very primitive state Therefore 10
doubtfu If the above precautions vi, IN
fact any of the essential precautions WIN
be taken to preserve the MIX lrohi pm
luton. ,oe srr,.ey about
sixtv dairy farms have been visited ana
the number of bacteria in the water sup
nlv determined. and also the presenee VI
absence of the colon bacliius. 10 h, .ass;hie
tests as strictly representative as possible
the work of plating water samples anu III
oculating fermentation tubes was eailieu
on entirely in the field, the water peins
ga mpled and plated Immediately upon pells
taken from the we'll or spring Inc pres
ence Of bacillus coli is not indicated uhless
occurring at least in one cuplc GENUINE . .ei'
."Of the sixty wells examined twenty-five
cnnt
oontinenter and of this number put
showed the presence of bacil. coli IN sam
nles of one c. c.: nine showed the presence
pf betw een 800 and 900 bacteria TO the
- q and of those three showed the pres
ence of bacil. coli; nineteen showed the
nresapce of 900 to 1000 bacteria to the
= and of these ten showed the presence
of bacillus coli: sixty showed the preseISe
of 10 coo to 10000 bacteria TO the cunic
oa,tioeter and of these nVe SnoWed the
presence of bacillus coll ,,.u.,.,, 90
20 Although there is great diversity Oh
on;nion as to what meteorological Iml,s
- nroner for well water. we may falriy
asSume that the wells containing less imam
eno bacteria to the cubic centimeter ana not
showing the presence of bacillus coll are
GOOD water supplies. Where local cohdiliohs
annear to give a high bacterial count Oh
HARMLESS bacteria water supplies containing
iaSs than 1000 bacteria to the CUBIC cenu-
meter and not showing the presence OF pa
cilIus coli may be counted as safe water.
,Tbe nresence of over 5000 and less than
10 600 bacteria to the cubic centimeter When
the colon bacillus is not present may be
considered suspicious, and water containing
moro than this number of bacteria to the
cuh,c centimeter should be considered unfit
for use The presence of the colon bacillus
must be studied in connection with the
total count and to some extent in connec-
ton with the local conditions in order to
determine the relative Importance of its
presence; or in other words. its relative i'm
portance as indicating sewage pollution.
Under these divisions we would be forced
to class the various well waters indicated
in the charts as follows: 16 good Is fair II
suspicious and II unfit. for use. Using this