THE University of Heidelberg is to celebrate this year the five hundred and fiftieth anniversary of its foundation, and it is proposed to give to the commemoration more than national significance. To this end, invitations to participate are being sent out widely, and universities and learned societies in Great Britain are being invited to send delegates. The Bishop of Durham, in a letter in The Times of February 4 discussing these invitations, quotes from the opening of the article on the dedication of the Philipp-Lenard-Institut at Heidelberg, which appeared in NATURE of January 18 (p. 93). This account, he says, demonstrates that the influence of the racial fanaticism which has swept over Germany and its universities has been specially severe in Heidelberg. In his opinion, which is held by many other intellectual leaders, “The appearance of British representatives at the Heidelberg celebration, and the presenting by them of congratulatory addresses, could not but be understood everywhere as a public and deliberate condonation of the intolerance which has emptied the German universities of many of their most eminent teachers.”