Sir,
In a recent paper (Reference PatersonPaterson, 1969), I stated that the islands in the north-western part of the Archipelago are marked “unglaciated” on the Glacial map of Canada. I am grateful to Dr W. Blake, Jr for pointing out that, whereas my statement is true for the 195R edition of the map, it is not true for the latest (1968) edition. On the 1968 map, only Ranks Island and a small part of southern Melville Island are marked “unglaciated”. It is now believed that the remainder of the islands were covered by a large. ice sheet during the last glaciation (Reference BlakeBlake, 1970).