▁( 1 8 7 9 – 8 0 ), ▁then ▁continued ▁his ▁studies ▁in ▁Berlin ▁under ▁August ▁Wilhelm ▁E ich ler ▁( 1 8 3 9 – 1 8 8 7 ) ▁and ▁Simon ▁Schw end ener ▁( 1 8 2 9 – 1 9 1 9 ). ▁Later ▁he ▁returned ▁to ▁Bonn ▁as ▁a ▁student ▁of ▁Edu ard ▁Str as burger ▁( 1 8 4 4 – 1 9 1 2 ), ▁receiving ▁his ▁doctor ate ▁in ▁ 1 8 8 4 . ▁In ▁ 1 8 8 9 ▁he ▁became ▁a ▁lect urer ▁in ▁Bonn , ▁and ▁in ▁ 1 8 9 6 ▁re located ▁to ▁the ▁Poly techn ic ▁Institute ▁of ▁D arm stadt , ▁where ▁he ▁was ▁appointed ▁director ▁of ▁the ▁botan ical ▁garden . ▁ ▁Sch en ck ▁under to ok ▁important ▁research ▁involving ▁adaptation ▁of ▁water ▁plants ▁to ▁their ▁under water ▁environment . ▁He ▁also ▁conducted ▁studies ▁on ▁the ▁e col ogy , ▁morph ology ▁and ▁hist ology ▁of ▁li anas . ▁In ▁ 1 8 8 6 - 8 7 ▁he ▁accompanied ▁Andreas ▁Franz ▁Wilhelm ▁Sch imper ▁( 1 8 5 6 – 1 9 0 1 ) ▁on ▁a ▁scientific ▁expedition ▁to ▁Brazil , ▁and ▁in ▁ 1 9 0 8 ▁performed ▁botan ical ▁investig ations ▁in ▁Mexico . ▁ ▁With ▁George ▁Kar sten ▁( 1 8 6 3 – 1 9 3 7 ), ▁he ▁was ▁co - author ▁of ▁the ▁botan ical ▁journal ▁Veg et ations b ilder . ▁In ▁addition , ▁he