Unpublished Harvard list contains nine nebulae published in [G. F. J. A.] Auwers's catalogue of novae, because those were first discovered at Harvard. Thanks JH for pointing out two others already published, which GB will exclude from list. Admits possibility of 'illusions' in some. Asks JH to compare results in C. F. Gauss's article on achromatic object glass. Sent copy of T. H. Safford's article on companion of Sirius.