iat ▁in ▁many ▁villages ▁on ▁the ▁ship ' s ▁ports ▁of ▁call . ▁ ▁Upon ▁completion ▁of ▁the ▁tour , ▁he ▁became ▁the ▁resident ▁phys ician ▁at ▁San ▁Francisco ▁Im m igration ▁Hospital . ▁ ▁He ▁was ▁not ▁able ▁to ▁revis it ▁Dr . ▁Blue , ▁who ▁had ▁since ▁left ▁to ▁become ▁the ▁Sur geon ▁General ▁following ▁the ▁death ▁of ▁Dr . ▁Walter ▁W yman . ▁ ▁Blue ▁had ▁not ▁forgotten ▁Dra per , ▁however , ▁and ▁made ▁arrang ements ▁for ▁him ▁to ▁attend ▁a ▁" ref res her ▁course " ▁at ▁the ▁H yg ien ic ▁Labor atory ▁in ▁Washington ▁D . C . ▁ ▁Washington ▁D . C . ▁assign ments ▁Early ▁in ▁September ▁ 1 9 1 2 , ▁Dra per ▁and ▁his ▁wife ▁moved ▁back ▁east ▁to ▁Washington , ▁D . C . ▁ ▁Dra per ▁was ▁one ▁of ▁about ▁eight ▁young ▁medical ▁officers ▁selected ▁for ▁the ▁ref res her ▁course ▁at ▁the ▁H yg ien ic ▁Labor atory , ▁for er un ner ▁of ▁the ▁National ▁Instit utes ▁of ▁Health . ▁ ▁Stud ents ▁who ▁were ▁successful ▁in ▁the ▁course ▁and ▁showed ▁an ▁apt itude ▁for ▁research ▁could ▁spend ▁several ▁years ▁or ▁even ▁a ▁career ▁doing ▁scientific ▁research . ▁ ▁This ▁appe aled ▁to ▁Dra per ▁at ▁this ▁point ▁in ▁his ▁life ▁since ▁he ▁had ▁just ▁spent ▁two ▁years ▁travel ing ▁extens ively , ▁and ▁with ▁a ▁pre gn ant ▁wife ▁he ▁liked ▁the ▁prospect ▁of ▁sett ling ▁down ▁in ▁one ▁place ▁for ▁a ▁while . ▁ ▁However