Evening star., 1924-11-29

| q. What arc hard water" and 500
water"?-J! G. VI.
! \. Hard water is water which COY
! tains dissolved in 1T certain sui
stances which interfere with the az
! tion Of soap 10y forming with it ar
insolublc compound or curd. TIL
hardness Of natural waters is princi
pally due to the salts of calcium and
! magnesium, especially calcium car
| Donate which produces temporary
| hardness, removable by boiling, AMI
calcium sulphate, which causes pcI
manent hardness Soft water is char
acterized by the practical absence o.
| substances which prevent the forrla
/ tion Of Iather with soaps.
| q. How old does a veteran ot tn,
| Spanish-American War have to be rcr
j the Government TO pension him
S. ". l..
y. The Pension Office says taa.
veterans of the Spanish-Americau
| War are pensioncd at the age Of 6
| unless they are disabled.
@. Please advise how the featfe7
| can be removed easily from a duck
Z. /. V.
\. If a wooden cloth wrung out Of
boiling water Is wrapped around the
duck and allowed to remain for sev-
can be easily and quickly removed.
Q. Which State leads in the pro
duction Of gold, silver and copper.
A. X.
A. California leads in the prodrc-
tion Of gold; Utah, Nevada and Mon
tana in silver, and Arizona in copper.
q. Can an officer OF an institution
receive and sign for registered anu
insured mail for students M. ". J.
4. The Post Office Department 50!
that registered and insured mails II
indorscd as follows: Deliver TO ad
drcssec only" should be delivered -
the person to whom il is addresse@
If not 50 indorsed. the mail may No
received by the person prescribed 20
receive the ordinary mail ii an r
stitution.
G. What IS the Law cf biogen.-.5
or recapitulation theory?-A. Il. A.
A. The rccapitulation theory is the
theory that a parallel exists between
the embryonic development Of an in
dividual and the historical evolution
of its race This parallel is explained
by the theory of evolution, according
To which, in the words of SedgHfcf,
the development history Of the in
dividual appears 10 be short ana
smplitied repetition, or in q certain
sense Il reCapitulati tion Of the cours"
Of development Of the species" The
theory IS correct 70 a limited extent
in the case of many animals, bur
there are many deviationS due 70 the
adaptation to environment, abbrevia-
ton Of the course OF development and
other influences.
Q. Are there any real Creek pain
ings in the worldly. o, l..
A. on a tripod in the Naples aIG
scum are mounted n few thin slabs Of
marble the paintings upon Whici
constitute the only real Greek paint
ings possessed by the world.
@ What IS the formula. fer light
house wlitewash"-S. T.
A. The Bureau or Lighthouses says
that the following formula is very
good for outdoor exposure "Sla,.A
half a bushol Of unslaked lime with
boiling water, keeping il covered dur
ing the process. Strain IL and add (.
peck OF salt, dissolved in warm wa
ter: three pounds ground rice put
in uHiling water and boiled to q thin
paste; half Il pound OF powdered
Spanish whiting and pound Of clear
glue. dissolved in warm water; mix
these we'll together and let the mi-i-
ture stand for several days. Keep tha
wash thus prepared in a kettle or
portable furnace, and when used put
it on as hot as possible, with paint
er'5 or whltewash brushes"
(Readers Of the Ercnin1 Star ShovlG
send their questions to The Star n
formation Bureau. Frederic J. HuSkin.
director, Ttrenty-frst ard C streets
northwest. The oniy charge for this
service is 2 cents in stamps for rcta.,.
POSTAGE