▁involved : ▁Stevens on ' s ▁two ▁sons ▁William ▁I vis on ▁Mac ad am ▁and ▁Stevens on ▁J . ▁C . ▁G . ▁Mac ad am ▁and ▁William ▁I vis on ▁Mac ad am ' s ▁daughter , ▁El ison ▁Mac ad am ▁( l ater ▁D esch ). ▁Seven ▁in ▁all ▁( if ▁one ▁includes ▁Charles ▁Thomas ▁Mac ad am ' s ▁invol vement ▁in ▁chemical ▁fert ilis ers ) l . ▁ ▁Professional ▁and ▁academic ▁career ▁ ▁In ▁ 1 8 5 0 ▁Dr . ▁Stevens on ▁Mac ad am ▁began ▁lect uring ▁in ▁the ▁Royal ▁College ▁of ▁Sur ge ons ▁of ▁Edinburgh ▁and ▁became ▁a ▁professor ▁there ▁( and ▁ultimately ▁held ▁that ▁position ▁for ▁ 5 0 ▁years ). ▁ ▁In ▁ 1 8 5 5 ▁he ▁also ▁began ▁lect uring ▁in ▁Chem istry ▁for ▁ph arma ce ut ical ▁students ▁on ▁his ▁own . ▁He ▁did ▁this ▁from ▁qu arters ▁on ▁Prin ces ▁Street , ▁Edinburgh ▁▁ ▁In ▁ 1 8 5 5 , ▁Dr . ▁Mac ad am ▁was ▁appointed ▁L ect urer ▁on ▁Chem istry ▁at ▁the ▁University ▁of ▁Edinburgh ▁Medical ▁School ▁and ▁the ▁University ▁of ▁Edinburgh ▁College ▁of ▁Medicine ▁and ▁V eter inary ▁Medicine ▁after ▁Dr . ▁George ▁Wilson ▁was ▁appointed ▁Reg is ▁Professor ▁of ▁Technology ▁at ▁Edinburgh ▁University ▁( from ▁ 1 8 5 5 ▁until ▁his ▁death ▁in ▁ 1 8 5 9 ) ▁although ▁Dr . ▁Wilson ▁retained ▁his ▁rooms ▁at ▁Sur ge ons ▁Hall . ▁ ▁During ▁that ▁time ▁Dr .