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Attheendof1830,HermannreturnedtoSzczecinandstart-
edworkingasanassistantteacher(Hillfslehrer)attheRoyal
SeminarintegratedwiththegymnasiuminSzczecin.Inthesame
year,hepassedanexaminancientlanguagesandmathematics.
HethenresumedhistheologicalstudiesandinMay1834he
passedhisfirstexam.Overtheperiodofthenexttwoyears,he
workedasmathematicsteacherattheBerlinIndustrialSchool,
wherehemetJakobSteiner.However,theBerlinenvironmentdid
notsuithim.HereturnedtoSzczecinandstartedworkingatthe
OttovonBambergMunicipalSchool(Ottoschule;equivalentof
aRealschule,butwithoutLatin),wherehetaughtmathematics,
chemistry,Germanandreligion.Heworkedthereuntil1842.
Inthemeantime,hisfatheralsopursuedscientificworkandin
1827publishedhisdissertationontheconceptsofpurenumber
theory.Thedissertationisinterestinginthatitissimilartothe
introductiontothefirstworkbyHermann,Ausdehnugslehre,
publishedin1844.
In1839,HermannG.Grassmannpassedhisexamintheology
withaVeryGoodgrade.Oneyearlater,hesubmittedhisfirst
scientificpapertothecommissioninBerlin,thusobtainingan
independentspecialisationandtherighttoteachlecturesinmath-
ematics,physics,mineralogyandchemistry.In1841,hewrote
twobooks:Zarysgramatykiniemieckiej(OutlineofGerman
Grammar)andPrzewodniknaukiniemieckiej(GuidetoGerman
Science)(withhisbrother,Gustaw).In1842,heabandonedhis
careerintheologyandbegantodevelopandcreatenewscientific
disciplines.
Inthesameyear,hestartedafamily.Accordingtohistorians,the
Grassmannshadelevenchildren(sevenofwhomlivedtoadult-
hood):Justus(bornin1851)wasamathematicianandadirector
oftheFriedrichWilhelmRealGymnasium,atwhichhisfather
worked;Max(bornin1852)tookaroadtomathematicsthrough
theology,wasaprofessoratMary’sGymnasium;HermannErnst
(bornin1857)wasaLatinteacherinHalleandthenbecame
aprofessorofmathematicsattheUniversityinGiessen;Ludolf
(bornin1861)wasthechiefphysicianinFlensburg,andRichard
(bornin1864)wasafullprofessorofmechanicalengineeringat
theSchoolofTechnologyinKarlsruhe.Theotherchildrenwere:
Emma(bornin1850),Agnes(bornin1855),Helmuth(bornin
1856),Luisa(bornin1858),Klara(bornin1866)andKonrad
(bornin1867).