New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1894-08-22
EucaIypta. Elizabeth G. Brtton; Species Of Tanb-
riha PARASITIC on Populus,' Mrs. F. W. Patterson
PARTS OF OLD TREES

Major Jed. Hotchkiss. OF Staunton. Va. showed
specimens of wood cut from trees that had beor
marked by surveyors lo7 years ago. The presence
OF the injury was still manifest upon the surface
OF the trees after all those years The erowth
each year was about one-twentieth of an inch
Ihese marks upon the trees corresponded with the
record or the survey made for patents In 1851 and
gave an excellent illustration of how long a cut
made in the surface of tree could be preserved.
:, The Section Economic Science and Statistics
listened TO papers upon Rate of Interest in the
United States Considered Geographically Henry
EGGS" James V. r. Swami: Weeds as Related to
EEvz;ation Byron D. Halstead; THE Provldential
Leading Statement of Greshams Law f. T. Peters;
r SGxey's Army and the Russian Thistle" L. H.
T Srhnsi Laura g Talbot Evolution of Cooking
sf The sd in washsgto c. Laura O. Talbot
Mrs Mrs, Laura Osborne Talbot read paper upon
W SGRe al pe ,h in Municipal Fire Departments
partment, the writer urged that each municipality
s snS provide hreproof and waterproof clothing
each fireman at the expense Of the city. Mrs. Tai
Schools SS also TAXED about the begnnngs of cooking
establishment of Missouri school OF cookery six
y, The Society for the Promotion OF Engineering
Edueation continued its sessions in the Polytechnic
ssEns Yesterday The society will continue in
!. Professor George w. P.ympton addressed the sec
G science and engneeTns Of the
"reminiscences of the Ear.y History of Iron-Bridge
DuI.uHIS III Inc United States
THE BUILDING OF IRON BRIDGES.
In his lecture DR.. P,ympton said:
The construction Of iron truss railway bridges
was only fairly begun in 1856 Engineers came from
long distance to inspect a whpp.e truss OF l6
feet span. built for the Albany Northern Railway
about 1852 l built two iron bridges in 1856. using
the whpple truss. The material was so distrusted
that careful test of al, tension members was
sary. A testing machine was built and the testing
fe.. to me. The machine quite constantly at
work for four five months. 1t popuiar.y and
enormously believed that iron. II kept under strain
or subject to vibrations. would decay. and become
granular weak and brittle We labored to disprove
THIS and Substantially did so The outcome Of our
tests In this direction settled conviction that
IN Lon bridges eye bars would replace both welded
links and diagona,s with screw threads Murphy
soon after this built the first iron bridge that was
pin-connected throughout The experience with
defective weld could be detected by the imperfect
ringing sound when struck We found by testing
that rods or bars joined by welding would respond
satisfactorily to the ringing test when only thin
shel or outside meta was perfectly joined pulled
of m s T Test t0 With
netic needle was not then known.
ton visited the Western Union Building at No. 1876
nS M ana Witnessed the RECEPTION
tional Observatory at Washington 10 all points OF
New England. James Hamblet who CONDUCTED the
visitors, described the time service OF New FORK and
Brooklyn and explained the manner OF synchronzing
about 800 clocks in New York and its vicinity The
party then went through the operating department
OF the building. and the details OF the ielegraphic
department were fully explained by the electricians
Assemblyman s. f. KneelanI will present papers
upon single tax and election methods before the
section economic science today.
The last public lecture complimentary to the ci-
Of Brooklyn given by the association. was by
DR.. b. Il. Fernow. OF Wastin ton He spoke in
Art Association Hall upon The Battle OF the
Forest" last evening. In ke course OF the lecture
which made especially interesting by the use OF
lantern slides for illustration. Dr. Fernow referred
to the Adirondacks. showing views OF forest destruc
ton by fire. waterstOrage and NUMBERING. and declal
ing that they need especially conservative treatment
because the soil itself there IS made by the forest
the dun covering the native rock formed at the rate
OF foot In 800 go years by the decay or foh.
age and liter. and hence rs loss by washing OF
| the rains is practically irremedable.
Let II not be overlooked he said. that the
| Safe Is not only the representative OF commune
interests against individual interests but also ~
future interests against the present; the private
interest Is not sufficient 70 protect this class OF
| lands; that State ownership or, what Is more OBJ
iectlonabe and less effective. State supervision Of
private foresands is ndispens ible In those regions
| where the forest subserves other functions than
that Of mere material supply