[ Sir James Dewar, Scottish scientist. ] Autograph Letter Signed ('James Dewar') to 'Miss Pollack', explaining his reason for missing an appointment.

3pp., 12mo. Bifolium. In good condition, on lightly-aged paper. He explains his 'great and chief excuse' for breaking his promise to call on her that morning. 'The fact is I have to give an address on Monday evening as President of the Society of Chemical Industry'.