INTWOVOLUMES

　　VOLUMEI。

　　PREFACETOTHESECONDEDITION。

　　Duringthesevenyearswhichhaveelapsedsincethepublicationin1868ofthefirsteditionofthisWork，Ihavecontinuedtoattendtothesamesubjects，asfaraslayinmypower;andIhavethusaccumulatedalargebodyofadditionalfacts，chieflythroughthekindnessofmanycorrespondents。OfthesefactsIhavebeenableheretouseonlythosewhichseemedtomethemoreimportant。Ihaveomittedsomestatements，andcorrectedsomeerrors，thediscoveryofwhichIowetomyreviewers。Manyadditionalreferenceshavebeengiven。Theeleventhchapter，andthatonPangenesis，arethosewhichhavebeenmostaltered，partshavingbeenre—

　　modelled;butIwillgivealistofthemoreimportantalterationsforthesakeofthosewhomaypossessthefirsteditionofthisbook。

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