The Washington herald., 1921-05-12
pes PsffM| Es5.;5
- Co., y se>rs.p;taj
Aefis<k<. - sso<as
/ II T 7 1I
l1flc(kl>s ~ Seulsfls
o. gssAzsrss
THURsDAY. may II. 1871.

Amerfcnn Insthute et hrchuecns
Annual Convention. National Mu-
scum today. sac a. m Election
OF ofncers. Report OF committee
on small houses Report Of strue-
tural Service Committee, and
statement OF George b Muldsur,
general agent Of the Undervri-
ters' Laboratories 2 p m, The
Minor Architecture Of France
by George Howe, and Recent
American Collegiate Architec-
ture" by Charles 2. Klauder.
Conference on the building In
Congress of the Building and
Construction Industry" by Robert
d. Kohn. and The National Board
by Jurisdictional Awards" By
Ernest J. Russell. and a discus
sion Of economic problems opened
by a paper by Charles II. Ham
mond. S:3O D. m, formal view
ing Of the second national archi-
tursl exhibition in foyer Of
museum. $3.50 y. m. conference
on government architecture and
the department OF public works,
J with short addresses by Herbert
Hoover. Secretary OF Commerce,
Representative c. Frank Reavis
and NJ. o. Leighton.
Society Of Motion Pfeture. Engineer,
Hotel Raleigh, today. 10 a. m.
Committee reports Action OF
Various Chemicals on Arc Lamp
Cores" by ". r. Mott; review Of
motion picture literature by r
p. Burrows. 1890 p. m. lunch
con, followed by an address by
Brig. Gen. o. Squier. l:3o p. m
Color ToninE of Cine Films" By
F. Z Ives.
Chemical Society OF WashInGtsn.
Cosmos Club. this evening, s D.
m. Symposium on optical meth
DDS as applied to chemical inves-
legations "QuantitatiVF Spectrum
Analysis" by w. r. Meggers: "Es-
timation OF CoIorless Substances
by Spectre -Photometric Methods"
by W. E Mathewson: "A Direct
Reading Spectre -Photometer for
Measuring the Transmissivity of
Liquids" by /. G. Priest; ''Polari-
metry," by Frederick Bstes:
-Chystal Optics in Chemistry" by
r. z. Wright
PLANTS TELL GEoLOGIsT
KIND OF ROCKS AND SOILS.
Everyone has noticed that Ger
tain plants grow by preference on
certain kinds Of rocks, but there are
many different views as TO the rea-
the Bureau Of Chemistry at the
Geological Society meeting last
night at the Cosmos Club.
The physical factors, such as
porosity, water-holding capacity,
EFa ~ ka
sidered the most influential, but my
experience indicates that the ChemI-
cal factors. and especially the acidi-
Using indicators. or dyes which
change their colors with different
degrees Of acidity and aIkalInity.
and making thousands OF tests OF all
sorts OF plants and rocks in the
field, l have found that many spe-
cies OF plants seem highly sensitive
to soil reaction. These sorts are
relatively indifferent to water con-
tent Of a soil. Other plants. on the
contrary. are sensitive to moisture
but more or less indifferent as to
reaction. Weeds are mostly indIr-
ferent TO both reaction and mois-
ture"
INV NAlNst AdNAS utlp INV Ef7NlN-
gist in his work was explained. Some
plants do definitely favor cslcareous
rocks, others as definitely shun
them. he said. However. Czlcareous
soils can accumulate on non-calcsre-
Gus rocks, and acid soils on calcs-e-
Gus rocks. so that care must be taken
in making observations. The pres
ence Of members or the heath family
is good indication that a rock il
nOn-calcsreous: the presence OF the
clin-brake ferns or Of the grass o'
Parnassus' on rock lodges indicates
that the rock is calcsreous
In answer TO the question as -
how a geologist can best learn
enough botany for il to be of use
in this connection. il was stated
that there is no book available The
best Introductory 10 practical r'ant
Identification is Wild Flower Preser-
vation.' by Coley and Weatherby.
How to Know the Wild Flowers
by Parsons, may also help. ] would
be glad to write a book on Botany
for the Geologist' IL anyone would
pay my living expenses for doing
So said DR.. Wherry.
LIGHTING OF MOVIE
THEATERS IMPORTANT