. ▁( vol . ▁cli x . ▁pp .   1 – 1 1 0 , ▁and ▁vol . ▁cl x . ▁pp .   3 8 9 – 4 9 6 ). ▁ ▁He ▁took ▁some ▁of ▁the ▁very ▁first ▁photos ▁of ▁the ▁moon , ▁so ▁he ▁got ▁a ▁cr ater ▁named ▁after ▁him ▁the ▁" De ▁La ▁R ue ▁( cr ater ) ". ▁In ▁ 1 8 6 0 ▁De ▁La ▁R ue ▁took ▁the ▁phot oh eli ograph ▁to ▁Spain ▁for ▁the ▁purpose ▁of ▁photograph ing ▁the ▁total ▁solar ▁eclipse ▁which ▁occurred ▁on ▁ 1 8 ▁July ▁of ▁that ▁year . ▁This ▁expedition ▁formed ▁the ▁subject ▁of ▁the ▁Baker ian ▁L ect ure ▁already ▁referred ▁to . ▁The ▁photograph s ▁obtained ▁on ▁that ▁occasion ▁proved ▁beyond ▁doubt ▁the ▁solar ▁character ▁of ▁the ▁prom in ences ▁or ▁red ▁fl ames , ▁seen ▁around ▁the ▁lim b ▁of ▁the ▁moon ▁during ▁a ▁solar ▁eclipse . ▁In ▁ 1 8 7 3 ▁De ▁La ▁R ue ▁gave ▁up ▁active ▁work ▁in ▁astronom y , ▁and ▁presented ▁most ▁of ▁his ▁astronom ical ▁instruments ▁to ▁the ▁university ▁observ atory , ▁Oxford . ▁Sub sequently , ▁in ▁the ▁year ▁ 1 8 8 7 , ▁he ▁provided ▁the ▁same ▁observ atory ▁with ▁a ▁ 1 3 - inch ▁ref ractor ▁to ▁enable ▁it ▁to ▁take ▁part ▁in ▁the ▁International ▁Phot ographic ▁Survey ▁of ▁the ▁He av ens . ▁ ▁With ▁Dr ▁Hugo ▁Müller ▁as ▁his ▁collabor ator ▁he ▁published ▁several ▁papers ▁of ▁a ▁chemical ▁character