New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1904-05-08

be anticipated from the gerrnicide MANY au-
thortties quoted on the subject Though
the Belgian Royal Academy Of Medicine de-
clded IN 1855. after a long discussion. that COP
Per compounds were harmful dozen experts
who have tried experiments on the higher ami
mails and man reach a different conclus on
One. Robert. thought it safe for a man weigh
ing only 10 pounds TO take gram 1519 grains,
or copper daily. Others adopted lower estt-
mates. some putting the maximum at half A
gram On this point the bulletin will say:
Ihere is still considerable difference of opin-
ION among eminent authorities as TO the exact
amount OF copper which may be injurious but
% d very conservative limit we may accept q 90
gram as the amount that may with safety be
I-o7'I &c oal4y Taking diIutiOn of 10
olIe IlllIioh which IN all cases would be sufficient
- PIeEelt the growth OF pOlluting algal form
II would ne necessary to drink something over
IWenty quarts OF water day before an amount
"hIch IS universally recognized as harmless
would be introduced into the system while
more than fifty quarts would have 10 be con-
sLIneu BEFORE there would be danger Of produc-
iLs an unpleasant or undesirable effect.
For distributing the salt IN a reservoir. one Of
the most convenient methods is 10 place II in
bag of gunny cloth and tow it around with
a rowboat- That was the plan adopted in the
Kentucky test. If. as sometimes happens the
water contains much organic acid little lime
may be added, 10 neutralize il. The well known
Iunglclde, the Bordeaux mixture. is A compound
Of lime and sulphate of copper. II has been
tried for controlling the growth Of aIgaI scum
IN lily ponds. and seems to have been tempo
raTi!y effective However, The Impractical bIIIty
or using such a mixture is apparent for the
destruction OF microscopic aIgae distributed
through reservoir or a lake containing mill
ions Of gallons.
Many experts have tried copper sulphate in
klIiIng bacillL and several put the amount need
60 at such degrees Of concentration as one 10
100 ana one 70 900 But they applied the soIu-
ton either 10 infected blood or to other albumi-
nous material Or. Moore points out that the
conditions are vastly different IN a reservoir Of
water. where higher diiution is easible be-
cause so little alDUminOId matter exists there.
Tabulated results are given in the report which
show that one part Of sUlphate 10 100000 OF
water is fatal in from two 10 twelve hours the
qulcknesS or action depending on the tempera-
ture- A number Of tests were made az tenn
peratures ranging from 80 degrees Fahrenheit
10 100 The bacillus coli. an intestinal microbe
needs stronger solution II IS an innocent or
gSnIsnc, however The bacillus Of Asiatic ChoI-
era seems 10 require a little sterner treatment
than that or typhoid To destroy the cholera
germ requires about three hours in one 10
IvouNp solution at temperature above 20 de-
grees centisrade or IS Fahrenheit. A longer
exposure OF higher concentration is necessary
20 produce this result at lower temperatures
Metallic copper alone exerts an influence upon
water that is brought in contact herewith
V Alrh is hurtrul ro bacteria and alg8-. without
affecting man Sheet copper could uoc be in
trodUCed simultaneously into large reservoirs.
but IL is recommended for small TANKS and army
cauteens Water thus affected is called a col
lOidal solution q copper" Its action cholera
and typhoid baciu IS more powerful than on
alEP
The multiplication Of mosquitoes may be az
fected in two ways by sulphate Of copper. The
latter kills the aIgae on which the larva feed.
so that the latter starvs, and solution 0f one
part 10 from 10000 10 10000 pOisons them.
Death IS brought about in the frst manner
with a much higher dilutiOn.
The suIphate has given excellent results IN
Riding watercress beds OF aIgB. AT first A
strong solution vas tried and II was applied
by spraying. This method gave poor results
The salt then dissolved in the beds and the
success 81 the treatment was almost iurne-
diately evident IN this case the amount OF
copper added was about equal 10 a strength OF
one 20 5otsDODo parts OF water.
The bureau reiterates earlier statement 70
the effect that the system OF sanitation here de-
scrihed is not intended 5 a substitute for n
tTatiou-