re- edward blyth,checked two sources on wed.one obviously pro darwinism.at time of writing on natural selection blyth was obviously creationist but sometime after this it seems he too drew comparisons between negros and apes,as darwin did ,i believe
note that i do not claim that the theory originated with blythe.it is however widely accepted that darwin used his writings [apparently without acknowledgment] .i am also aware that evolutionary ideas date back to the greeks also.