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Show Butterfl/s Butterfl s Butterfly's Butterflys / ' "TrunlIs "Trunk Trunk "Trunl\ "Trunl Trunl "TrunkIs " \ : " Is ExplainedDelaware Explained by byDelaware Delavare Delaware , Scientist ScientistNewark ScientistNewark Newark , Del-ButterflIes Del ButterflIes DelButterflies Del Butterflies -Butterflies - and andmoths andmoths andmoths moths uncoil uncotl their long pro- pro probosces probosces pro-bosces pro bosces - bosces , or "trunks trunks "trunI-.s trunI.s "trunI trunI .s s " - . , " on very verymuch verymuch verymuch much the sime S1.me S1me same . principle prl11clple as asthat asthat asthat that used in the toy paper paper"snal"es paper"snakes paper"snakes papersnakes "snal"es snales "snakes snakes " " " that startlmgly startlIngly dart dartinto dartinto dartinto into your face at carnivals carl11vals . This simple mechanical mechamcal explana e'cplana- e'cplana ecplana e'cplanation cxplanatlon ' . - tIon of one of biology's biologys ' most diffi- diffi dim difficult difucult - . cult riddles nddles has been discovered by byDr byDr b : Dr . J B Schmitt of the Universityof Umversltyof Umverslty University of Dela\\ Dela Delaware Delaare \ \ are DelawareIn areIn In Two Sections . A butterfly's butterflys butterfiy's butterfiys ' proboscis is not a asImple asimple asimple sImple tube tub or pipe It is made oftwo of oftwo 1\\ 1 10 two \ \ 0 trough shaped sections sechons , . held to- to together together to together - gether at the edges , so that it "adds adds "addsup "addsup "addsup addsup " up " as a tube through which the themsect theinsect theinsect msect insect can suck up flower JUlcesIn juicesIn juices JUlces juicesIn In each half , beneath the troughthere trough , , there is a tube , closed at the outer outertIP outertip outeztip tIP , but communicating communicahng with the thehead thehead thehead head cavity at its base Each Iach ; of ofthese ofthese olthese these tubes is filled11th died filled \ with \11th 11th frith blood Nor- Nor Normally Normally Normally - , mally , the proboscis is kept coiledby cOIled coiledby by the pull of many short muscles musclesarranged , I Iarranged arranged diagonally . But when the the'Insect theinsect theinsect 'Insect Insect ' insect Is ready to feed , a valve valvecloses valvecloses valv valvcloses < closes at the base of each tube tubepreventing , xreventmg preventing : the blood from flowingback fiowmg flowing fiowmgback flowingback back into mto the head . At the same samehme sametime sametime hme time , certain certaUl muscles squeeze down downon downon downon on the base of the tube , . like a hand handon handon hancon on a rubber bulb This puts pres- pres pressure pressure - . sure on the fluid , which has no- no nowhere nowhere nowhere - where to go but out , so that it itpushes itpushes ipushes pushes out into the tube and andstraightens andstraightens an anstraightens < straightens it out |
