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The requested URL /mbrowse/msdb/OriginOfSpecies/description/is/Instances+could+be+given+amongst+plants+and+insects,+of+a+group+of+forms,+first+ranked+by+practised+naturalists+as+only+a+genus,+and+then+raised+to+the+rank+of+a+sub-family+or+family;+and+this+has+been+done,+not+because+further+research+has+detected+important+structural+differences,+at+first+overlooked,+but+because+numerous+allied+species,+with+slightly+different+grades+of+difference,+have+been+subsequently+discovered. All+the+foregoing+rules+and+aids+and+difficulties+in+classification+are+explained,+if+I+do+not+greatly+deceive+myself,+on+the+view+that+the+natural+system+is+founded+on+descent+with+modification;+that+the+characters+which+naturalists+consider+as+showing+true+affinity+between+any+two+or+more+species,+are+those+which+have+been+inherited+from+a+common+parent,+and,+in+so+far,+all+true+classification+is+genealogical;+that+community+of+descent+is+the+hidden+bond+which+naturalists+have+been+unconsciously+seeking,+and+not+some+unknown+plan+of+creation,+or+the+enunciation+of+general+propositions,+and+the+mere+putting+together+and+separating+objects+more+or+less+alike. But+I+must+explain+my+meaning+more+fully. I+believe+that+the+arrangement+of+the+groups+within+each+class,+in+due+subordination+and+relation+to+the+other+groups,+must+be+strictly+genealogical+in+order+to+be+natural;+but+that+the+amount+of+difference+in+the+several+branches+or+groups,+though+allied+in+the+same+degree+in+blood+to+their+common+progenitor,+may+differ+greatly,+being+due+to+the+different+degrees+of+modification+which+they+have+undergone;+and+this+is+expressed+by+the+forms+being+ranked+under+different+genera,+families,+sections,+or+orders. The+reader+will+best+understand+what+is+meant,+if+he+will+take+the+trouble+of+referring+to+the+diagram+in+the+fourth+chapter. [[[[[images/NaturalSelection.jpg]]]]]/ was not found on this server.