All such changes of structure, whether extremely slight or strongly marked, which appear among many individuals living together, may be considered as the in definite effects of the conditions of life on each individual organism, in nearly the same manner as the chill effects different men in an in definite manner, according to their state of body or constitution, causing coughs or colds, rheumatism, or inflammation of various organs.
Elkarrekin bizi diren banako askoren artean agertzen diren egitura-aldaketa hauek guztiok, arinki zein nabariki markatuak izan, banako bakoitzarengan bizi-baldintzek eraginiko ondoren zehazgabetzat har daitezke, hotzak gizakume ezberdinengan ondorio ezberdinak izaten dituen modura, nori bere gorputz edo osaeraren baldintzen arabera eztula edo marfundia, erreumatismoa edo hango edo hemengo organoan handitua eraginik.