Butitwillbemorepleasantandmoreprofitabletoconsiderthosecriticisms，whichwereacknowledgedbywritersofscientificauthority，orwhichboreinternalevidenceofthegreaterorlesscompetencyand，often，ofthegoodfaith，oftheirauthors。Restrictingmysurveytoatwelvemonth，orthereabouts，afterthepublicationofthe’Origin，’IfindamongsuchcriticsLouisAgassiz（\"TheargumentspresentedbyDarwininfavorofauniversalderivationfromoneprimaryformofallthepeculiaritiesexistingnowamonglivingbeingshavenotmadetheslightestimpressiononmymind。\"
\"UntilthefactsofNatureareshowntohavebeenmistakenbythosewhohavecollectedthem，andthattheyhaveadifferentmeaningfromthatnowgenerallyassignedtothem，Ishallthereforeconsiderthetransmutationtheoryasascientificmistake，untrueinitsfacts，unscientificinitsmethod，andmischievousinitstendency。\"——Silliman’s’Journal，’July，1860，pages143，154。Extractfromthe3rdvolumeof’ContributionstotheNaturalHistoryoftheUnitedStates。’）;Murray，anexcellententomologist;
Harvey，abotanistofconsiderablerepute;andtheauthorofanarticleinthe’EdinburghReview，’allstronglyadversetoDarwin。Pictet，thedistinguishedandwidelylearnedpaleontogistofGeneva，treatsMr。Darwinwitharespectwhichformsagratefulcontrasttothetoneofsomeoftheprecedingwriters，butconsentstogowithhimonlyaverylittleway。（\"I
seenoseriousobjectionstotheformationofvarietiesbynaturalselectionintheexistingworld，andthat，sofarasearlierepochsareconcerned，thislawmaybeassumedtoexplaintheoriginofcloselyalliedspecies，supposingforthispurposeaverylongperiodoftime。\"
\"Withregardtosimplevarietiesandcloselyalliedspecies，IbelievethatMr。Darwin’stheorymayexplainmanythings，andthrowagreatlightuponnumerousquestions。\"——’Surl’Originedel’Espece。ParCharlesDarwin。’