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The requested URL /mbrowse/msdb/OriginOfSpecies/description/is/Disuse,+aided+sometimes+by+natural+selection,+will+often+tend+to+reduce+an+organ,+when+it+has+become+useless+by+changed+habits+or+under+changed+conditions+of+life;+and+we+can+clearly+understand+on+this+view+the+meaning+of+rudimentary+organs. But+disuse+and+selection+will+generally+act+on+each+creature,+when+it+has+come+to+maturity+and+has+to+play+its+full+part+in+the+struggle+for+existence,+and+will+thus+have+little+power+of+acting+on+an+organ+during+early+life;+hence+the+organ+will+not+be+much+reduced+or+rendered+rudimentary+at+this+early+age. The+calf,+for+instance,+has+inherited+teeth,+which+never+cut+through+the+gums+of+the+upper+jaw,+from+an+early+progenitor+having+well-developed+teeth;+and+we+may+believe,+that+the+teeth+in+the+mature+animal+were+reduced,+during+successive+generations,+by+disuse+or+by+the+tongue+and+palate+having+been+fitted+by+natural+selection+to+browse+without+their+aid;+whereas+in+the+calf,+the+teeth+have+been+left+untouched+by+selection+or+disuse,+and+on+the+principle+of+inheritance+at+corresponding+ages+have+been+inherited+from+a+remote+period+to+the+present+day. On+the+view+of+each+organic+being+and+each+separate+organ+having+been+specially+created,+how+utterly+inexplicable+it+is+that+parts,+like+the+teeth+in+the+embryonic+calf+or+like+the+shrivelled+wings+under+the+soldered+wing-covers+of+some+beetles,+should+thus+so+frequently+bear+the+plain+stamp+of+inutility!+Nature+may+be+said+to+have+taken+pains+to+reveal,+by+rudimentary+organs+and+by+homologous+structures,+her+scheme+of+modification,+which+it+seems+that+we+wilfully+will+not+understand. [[[[[images/beetle.jpg|beetle]]]]]/ was not found on this server.