Letter to Edward Clark Streeter from William Osler, 13, Norham Gardens, Oxford, Oxfordshire, England. He is sending the Raynald 1545 copy. If he or the Library takes it , the cheque must be send to MacAlister. Mentions that he has added notes at the back of the copy. Details about it. Comments on a book Streeter would like to sell him. Explains that he is afraid that after the war he could not afford to buy gems like that. Enjoins him to stick to Aristotle, as the profession needs a few men who know the Master first hand. Offers to pick up Ogles edition of de partibus animalium if he does not have it. Recommends D'Arcy Thompson's Aristotle as a Biologist. Good comments about it. Allusion to the plans they are making for a Summer School in the History of Science, after the war. Mentions the Singers and the Science room at Bodley. Glad they have got Sarton at Harvard. Comments on Sudhoff. The war is digging a great gulf between the English and the Germans. Glad he saw Warren's treasures. Invites him for a long visit after the war. Optimistic about war. - Osler's notes on the Raynalde.