▁work ▁on ▁ind igo ▁d ye , ▁a ▁mil estone ▁in ▁modern ▁industrial ▁organ ic ▁chem istry ▁which ▁revolution izes ▁the ▁d ye ▁industry . ▁ ▁Johann ▁Josef ▁Los ch midt ▁determ ines ▁the ▁exact ▁number ▁of ▁mole cules ▁in ▁a ▁mole , ▁later ▁named ▁Av og ad ro ' s ▁number . ▁ ▁Life ▁sciences ▁ ▁Louis ▁P aste ur ▁shows ▁that ▁the ▁air ▁is ▁full ▁of ▁b acter ia . ▁ ▁Joseph ▁L ister ▁begins ▁to ▁experiment ▁with ▁ant ise ptic ▁surg ery ▁in ▁Glasgow ▁using ▁car bol ic ▁acid . ▁ ▁Max ▁Sch ult ze ▁gives ▁the ▁first ▁known ▁description ▁of ▁the ▁plate let . ▁ ▁Claude ▁Bernard ▁publish es ▁Princi pes ▁de ▁Mé dec ine ▁experiment ale . ▁ ▁February ▁ 8 ▁& ▁March ▁ 8 ▁– ▁Greg or ▁M end el ▁reads ▁his ▁paper , ▁Vers uche ▁über ▁Pfl anzen hy br iden ▁( Ex per iments ▁on ▁Plant ▁Hy brid ization ), ▁at ▁two ▁meet ings ▁of ▁the ▁Natural ▁History ▁Society ▁of ▁Br ün n ▁in ▁Mor avia . ▁ ▁May ▁ 1 7 ▁– ▁Father ▁Arm and ▁David ▁first ▁obser ves ▁P ère ▁David ' s ▁De er ▁in ▁China . ▁ ▁June – August ▁– ▁Francis ▁Gal ton ▁form ul ates ▁e ugen ics . ▁ ▁September ▁– ▁John ▁Henry ▁Wal sh ▁( writing ▁as ▁' St one hen ge ' ▁in ▁the ▁magazine ▁The ▁Field ) ▁gives ▁the ▁first ▁definition ▁of ▁a ▁dog ▁bre ed ▁standard ▁( for ▁the ▁pointer ) ▁based ▁on ▁physical