New-York tribune., 1882-04-20

PAPER READ by PROFESSOR Riley ON THE COTTox
WORM AND METHODS OF DESTROYING IT.
OTHER PAPERS READ AT THE SECOND DAY,
SESSIONS.
lBY TELEGRAPH TO THE TRIBUSRJ
WASHINGTON, April 19.-AmOng the paner,
read before the National Academy OF Sciences tosa
was one by Professor V. Riley EntomoIogist of ~.
Department OF Agriculture, discoveries tba,
enhance the value of the cotton aud orange cror.
Professor Riley said that In paper read before ~.
Academy In 1879 1t hal been sho wn By tho rooat oa
iui computation, that the annual loss from tie cot
ton wogm had averaged Sl50OOO0O from tho
close OF the war to that me and consequently any e
Tort TO protect the plant from Its rayages was well
worthy OF consideration from national point OF view
At that time" he said the chief and only salts
factory remedy against the depredatons OF the insect
was an application Of form OF arsenic and partcu
Larry OF paris green, thrown broadcast over
them by more or less imperfect dustng or sprnkln con-
triyanoes Though many planter has sayed his
crop from destruction by the crude methods In vogue
al that time, yet recognized that great rom
iQr Improvement, not Only in possibly discovering
cheaper aud less poisonous insectcdc but in red long
the cost or arsenca mi Xtures aud particularly render
ing them more effective by Improved methods Of aPplc
tlOn nave the pleasure OF reporting that since that
time the experiments which nave been conducting,
whether for the United chronological COmmis,
son or for the Department Of agriculture have resulted
IN great advances both in tine materials employed and
tie methods OF their employment. Not dcain the
Academy with details submit the following bare state
As cheaper substitute for paris green arscnlca re-
fuse from the manufacture of anylne dyes mad a
that time not been fuy tested has proved the whole
very SATISFACTORY ana Reduces the hrs cost OF material
from an average of 80 cents TO average of per
less TO the higher animals ana plants.
ply mixed in water at the OF ratio about pound
about 100 gallons OF water and hayebeeu for two years
cultivation In all sections OF the country it viii
grow and the success thus far Ia quite encouraging.
Both the pyrethrun r0seum and the pyfethrum elmer
have fourished in widely different latltudes
in this city have passed unnured ike t1c severe Sinr
OF 1891 and the mild winter OK loSl-2. and are now
The greatest advance however, has been msde in
improved apph ances. 1 could not begin 70 enumerato
spraying whether by horsepower or by hand that nave
been perfected and are now being illustrated and
described in final report already ordered by Con-
gress. BY the adoption of an entirely new atomizing
principle, conceived by one OF my assistants
principle, able TO throw spray Of any extent de
sired from the ground upward ono.tDe under surface Of
need be. With this cyclone nozzle attached in null ple
to a wagon and worked with small force pump, one
methods and will suffice for 10 acres, accord
ing TO the size OF the cotton and heighs
In short, at a first cost for material Of
cent per acre, two men with a team and wagon can
cotton last a. the team can walk
Professor Riley showed tne great advantages OF the
system of spraying from below Instead OF throwing
bioAdcast from above. He announced discovery u
both scientific and practical interest rcsa: ding tue
hi berIation or the cotton He said " there
nothing fully established no" than hat the moth
hlDcrnates principally under the shelter o rank wrs
grass III the more heavily umOereu poItlons Oh inc
South that these moths begin laying Oh ne rotton cot
ton when this is only inch or so hlgh. That
the first few generations OF worms are
rarely noticed, and never particularly Injurious
is due to fact that they more generally dpcrsed
the moth appearing to hl great distances. Laying ere
In 6 egg aI na as il does later in Tie season few in
,tralp
mics st issuing their winter quarters and nnns
scarcity VI food also 10 the less rapid develop
ment during the spring months Aslue from tle saus
faction o bridging over so Important gap n the natuia
established has this lms orIant Sc0homlc bearing
Whereas upon the theory o. annual Inv slOl from some
spring work looking 10 the destruction VI the motns
every Incentive ~ such action as VIII do
stroy IL, el,her ny attacking IL during IhIa ~htet
weather by swees or Oy burning the grasses ID "ict
il shelters IL should also be a warning 10 cotton
growers 10 aDaldOn the soyenly method OIL CULTIVATION
uch leaves The cotton staiAs slauhS ether ui ths
next crop planted long amer tnat event. iOr na1y
planters na0lt Of planting le seed Ia fITros
between the Old rows OF staiAs
The most careful recent researches all tend to
firm the belief the gO5sJ plum 10 the OhIy plant upon
nic tne worm can iced SO that in the ht OF the iaca
which Presented 10 yoJ there Is ali the greater
Incentive that mode Of culture which Will prevent Lat
growtn OF rattoon cotton since Is very Objectionable
he the would survive long enoughto perpen
ate Itself upon newly cotton, except Ior the inter
venuon VI the rattoOn cotton"
Tie other papers presented to-day were Preliminary
Notice OF a new Diving Engine by Professor. Ia Row
land, of Johns Hopkins University " On Photographs
of the Spectrum OF the Nebus in Orion"
BY Henry Draper read By DR.. Barker Theory Of Con-
cave Gratings," oy III. A Rowland; Mote u Special
Form OF Secondary Battery or Electric Accumulator"
by Professor Wocot Gibbs OF Cambridge; kesearcAes
Oh Complex inorganic Acld (continued) by Proitssof
by Professor ). L. Langley VI the Allegheny OJserv$
tory.