The Prince George's enquirer and southern Maryland advertiser. (Upper Marlborough, Md.) 1882-1925, 1908-05-22
The principle on which this instru-

ment works is illustrated in Fig. 2.
The apparent diameter of an object is
inversely proportional to its distance
from the eye, i. e., if the distance is
reduced to one-half, the diameter
will appear twice as large; if the
distance is reduced to one-third, the
diameter will appear three times as
large, and so on. AS the nearest dis
tance at which the average person
can see an object clearly is about six
inches, it follows that the diameter
of an object three-fourths of an inch
from the eye would appear eight
times the normal size. The object
would then be magnified eight diam
eters. or sixty-four times. (The area
would appear siyty-four times as
large) But an object three-fourths
of an inch from the eye appears so
blurred that none Of the details are
'discernible, and it is for this reason
that the pin-hole is employed.
Viewed through this microscope,
a f1y's wing appears as large as a
persons hand, held at arms length,
and has the general appearance
shown in Fig. 3. The mother of vim
=, egar examined in the same way is
seeR:to be swarming with a mass of
wriggHng little worms, and may pos
sibfy cause the observer to abstain
from all salads forever after. An in
nocent locking drop of water, in
which hay has been soaked for sew
eral days, reveals hundreds of little
infusoria, darting across the field in
( every direction. These and hum
{ dreds of OTHER interesting objects may
be observed in this little instrument,
which costs little or nothing to make.
WHAT SAWDrST MARY KEPT.
Fer two or three days Sister Mary
hasn't been very WELL" said Marian;
'she didn't sleep much last night"
Sister Mary" was the rag doll who
slept with Marian, ate with her, rode
with her, walked with her, did every
thing that Marian did as nearly as a
rag doll could. She was named for
Brother Franks wife, who had made
her for Marian, and who was Sister
Mary, too.
:, If my face were as dirty as Sister
Mays" said mamma, Il think /
would feel very badly. Let's put her
in the wash, and perhaps Aunt Jane
can make her we'll"
Mamma found a doll that had been
hers when she was little girl, so
Marian decided to let it take the
place of Sister Mary for one day.
Her name is Mary, too" said
mamma. Il didn't know when !
played with her that l would have
a daughter-inlaw named Mary, and
a little girl named Marian, and a
little girls doll named Mary"
The new doll wore a funny, old
fashioned dress yellow with age. for
she had not been played with since
mamma was a little girl. Marian and
mamma made her dress. while Sis
ter Wary tumbled about in the big
boiler and later hung her clothes on
the clothes-line. While mamma
sewed, Marian stuck pins into Mar
ian's saWdust sides. Sister Mary was
filled with cotton, and wasn't easy
to stick, but Mary's body was weak
with old age, and one of the pins
made a little torn place. Marian let
the sawdust run out in tiny stream
until Mary's body was very thin.
Then she felt. something hard. She
moved it about and tore large piece
so it could come out, and just then
mamma looked up.
"Whr, my little ring." she said.