9 1 4 . ▁ ▁It ▁was ▁only ▁after ▁the ▁Second ▁World ▁War ▁that ▁the ▁Society ' s ▁concerns ▁about ▁the ▁cost ▁of ▁its ▁journ als ▁were ▁finally ▁all ay ed . ▁There ▁had ▁been ▁a ▁one - off ▁sur plus ▁in ▁ 1 9 3 2 , ▁but ▁it ▁was ▁only ▁from ▁ 1 9 4 8 ▁that ▁the ▁Trans actions ▁began ▁regularly ▁to ▁end ▁the ▁year ▁in ▁sur plus . ▁That ▁year , ▁despite ▁a ▁three - fold ▁increase ▁in ▁production ▁costs ▁( it ▁was ▁a ▁b um per ▁year ▁for ▁papers ), ▁there ▁was ▁a ▁sur plus ▁of ▁almost ▁£ 4 0 0 . ▁Part ▁of ▁the ▁post - war ▁financial ▁success ▁of ▁the ▁Trans actions ▁was ▁due ▁to ▁the ▁rising ▁subscri ptions ▁received , ▁and ▁a ▁growing ▁number ▁of ▁subscri ptions ▁from ▁British ▁and ▁international ▁institutions , ▁including ▁univers ities , ▁industry , ▁and ▁government ; ▁this ▁was ▁at ▁the ▁same ▁time ▁as ▁private ▁subscri ptions , ▁outside ▁of ▁fell ows , ▁were ▁non - ex istent . ▁By ▁the ▁early ▁ 1 9 7 0 s , ▁institution al ▁subscription ▁was ▁the ▁main ▁channel ▁of ▁income ▁from ▁publication ▁sales ▁for ▁the ▁society . ▁In ▁ 1 9 7 0 – 1 9 7 1 , ▁ 4 3 , 7 6 0 ▁copies ▁of ▁Trans actions ▁were ▁sold , ▁of ▁which ▁cas ual ▁purch as ers ▁account ed ▁for ▁only ▁ 2 0 7 0 ▁copies . ▁ ▁All ▁of ▁the ▁Society ' s ▁publications ▁now ▁had ▁a