(1) ENGLISH-SPEAKING scientific workers already owe much to Prof. Southall, since it was he who edited the English translation of Helmholtz's great work on physiological optics. Prof. Southall's aim ...

IT was (Ji surprise to read in Dr. Cosslett's preface that a course of lectures in electron optics has seen given in the honours physics course at Oxford since 1942; yet the surprise was unwarranted ...