Evening star., 1935-12-13


at end Of the egg and eats its way
into epithelial tissue Of the mother
to form jagged and extremely close
contact through which blood cells OF
the parent organism can pass to the
embryo.
Never ''Hooking" Process.
There Is never, Or. Streeter says,
any actual hooking" of parent tissue
and egg surface. The connection Is
somewhat like that OF q bit Of cigar
cite paper against the epithelial sur
face Of a moist lip. Thus at the time
Of birth there need be no violent
tearing away of the two tissues.
u TO the time Of the formation Of
this cellular substance, DR.. Streeter
said. the process Of cell division goes
on slowly and without nourishment.
Further progress would be impossible.
Another product Of the auxiliary
substances is the so-called "cawl', or
shell of the egg. which has consid-
cradle standing in Celtic superstition.
BY the new technique developed in
DR.. Streeter's laboratory it has been
possible to observe, step by step, the
process Of mammalian development
through the first IL days of embry.
onic life. In the past study Of these
early stages has been possible only by
shooting large numbers Of female
monkeys In the forest Of their native
India on the theory that II enough
were slain embryos at the various
| week or month stages could be
obtained.
At the Carnegie laboratory an opera
ton has been devised which requires
extremely skillful surgeons by which
eggs at various stages Of development
can be obtained without permanent or
serious injury to the animal. The same
monkeys are used over and over again,
furnishing a wealth of material never
before dreamed of.
The next step requires even more
skillful technique. 1t is the cutting
into many sections Of an egg so small
it is barely visible to the naked eye,
and the mathematical reconstruction
Of its cell structure. With the basis
now established. Dr. Streeter and his
colleagues believe they have opened
the road to study Of one Of the most
fundamental of all life processes.
Processes Humanlike.
In the past, DR.. Streeter said, the
physiological processes of the macaque
monkey have been found practically
identical with those Of the human
being. The egg development follows
practically the same path for the first
few months, the processes duplicating
themselves day by day.
A feature Of the research exhibit
prepared for the trustees today was an
assembly of various astronomical In
struments now in use at the Mount
Wilson laboratory of the institution.
Among these was the 6O-inch tele-
scope mirror to be used in connection
with the new 200-inch telescope. Be-
side it was an exact duplication Of the
first telescope used by Gallileo.
Among the recent astronomical
problems Of the observatory, work on
which formed part Of the exhibit. is
the makeup of the gaseous shells
elected by the strange nova Hercules"
the new star which increased in bright.
ness 100-fold a year ago and Stll Is
prominent in the heavens. Another
is the composition of the remarkable
new series Of sun spots which cover an
area of 100000, 900 square miles on the
surface Of the sun.
There was private showing Of the
exhibit today before the trustees and
members Of the stan. 1t will be open
to the public, with a series of daily
lectures, Saturday. Sunday and Mon.
day.
In his address to the trustees today
President John c. Merriam stressed
the services and ideals Of Andrew
| Carnegie, founder of the institution,
whose Tooth birthday anniversary IL
\ hei1c OhSprved "a.