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The requested URL /mbrowse/msdb/OriginOfSpecies/description/is/But+it+may+be+urged+that+when+several+closely-allied+species+inhabit+the+same+territory,+we+surely+ought+to+find+at+the+present+time+many+transitional+forms. Let+us+take+a+simple+case:+in+travelling+from+north+to+south+over+a+continent,+we+generally+meet+at+successive+intervals+with+closely+allied+or+representative+species,+evidently+filling+nearly+the+same+place+in+the+natural+economy+of+the+land. These+representative+species+often+meet+and+interlock;+and+as+the+one+becomes+rarer+and+rarer,+the+other+becomes+more+and+more+frequent,+till+the+one+replaces+the+other. But+if+we+compare+these+species+where+they+intermingle,+they+are+generally+as+absolutely+distinct+from+each+other+in+every+detail+of+structure+as+are+specimens+taken+from+the+metropolis+inhabited+by+each. By+my+theory+these+allied+species+are+descended+from+a+common+parent;+and+during+the+process+of+modification,+each+has+become+adapted+to+the+conditions+of+life+of+its+own+region,+and+has+supplanted+and+exterminated+its+original+parent-form+and+all+the+transitional+varieties+between+its+past+and+present+states. Hence+we+ought+not+to+expect+at+the+present+time+to+meet+with+numerous+transitional+varieties+in+each+region,+though+they+must+have+existed+there,+and+may+be+embedded+there+in+a+fossil+condition. But+in+the+intermediate+region,+having+intermediate+conditions+of+life,+why+do+we+not+now+find+closely-linking+intermediate+varieties? This+difficulty+for+a+long+time+quite+confounded+me. But+I+think+it+can+be+in+large+part+explained. [[[[[images/fossil.jpg|fossil]]]]]/ was not found on this server.