The following data on the Lake Louise area correct and supplement the 1940 edition of the Guidebook and are based on information contained in the extracts from Christian Kaufmann’s Fiihrerbucli, printed in this issue, as well as in the account by E. Tewes of his climbs in that area in 1903 (D. Oe. A.V. xxxvi, 133).

Cathedral Pass, referred to in A. A. J. iv, 309, was first crossed in 1903 by C. E. Fay, E. Tewes, C. Bohren, C. Kaufmann, from Field to Lake O’Hara.