( Presidential Address, December , 1944). So far, this Address has dwelt on fundamentals, testing one by one the foundations of our reasoning. Arising from that we now know, against all expectation, that the Drifts of this north country derive entirely from englacial detritus, released by undermelting. Unless, that is, you care to except some small end-moraines, reported from the Central Pennines, for everything else is of subglacial origin, even those sands, silts—I did not say clays—and gravels which have been arranged by running water. Despite conventional belief, there are amongst them no outwash gravels, lake clays or other extraglacial sediments; or none that I know of, the few truly lacustrine sediments being of post-Glacial date. Assertions of so sweeping a character cry aloud for opposition. But be patient: you will find, amongst the data to follow, plenty of new evidence in their support. And may I quote, though with small hope that anybody will heed, that notable advice we owe to Francis Bacon:— ‘Read, not to contradict, nor to believe, but to weigh and consider.’ It is natural that the next step should be from the general to the particular. Yet it is not easy to say where one should begin; critical studies with so revolutionary a basis as this are apt to be confronted with an embarrassment of riches. The key, as you will find, has opened an Aladdin’s Cave … In the circumstances perhaps as good a way as any is to open with a discussion on ...