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The requested URL /mbrowse/msdb/OriginOfSpecies/description/is/Glancing+at+instincts,+marvellous+as+some+are,+they+offer+no+greater+difficulty+than+does+corporeal+structure+on+the+theory+of+the+natural+selection+of+successive,+slight,+but+profitable+modifications. We+can+thus+understand+why+nature+moves+by+graduated+steps+in+endowing+different+animals+of+the+same+class+with+their+several+instincts. I+have+attempted+to+show+how+much+light+the+principle+of+gradation+throws+on+the+admirable+architectural+powers+of+the+hive-bee. [[[[[images/Hive+Bee.jpg|Hive+Bee]]]]] Habit+no+doubt+sometimes+comes+into+play+in+modifying+instincts;+but+it+certainly+is+not+indispensable,+as+we+see,+in+the+case+of+neuter+insects,+which+leave+no+progeny+to+inherit+the+effects+of+long-continued+habit. [[[[[images/ant.jpg|ant]]]]]/ was not found on this server.