Usher, Charles Howard Manuscript. Thanks K Pearson for his comments on his paper On the Inheritance of Retinitis Pigmentosa, and congratulating him on his Honorary Degree from Aberdeen University; on his new address at General Hospital, Salonica, in September 1916; sends Pearson an opthalmoscope; schedules from study of effect of tobacco on vision; reasons for not visiting Pearson and not attending the meeting of the Royal Society of Medicine; E M Elderton's work on tobacco amblyopes; on showing microscopic specimens, listed on an enclosed sheet, at a planned opthalmology convention in London in July 1925; examination report of Pearson's albino dog "Jetson"; response to Press Reader's queries and correction of proofs, encloses K Pearson's original letter; enquiry into dates of mating of dogs; on pigmented cells in eyes, describing particular cases; preserving anonymity of subjects in published photographs; his focus on looking for mesoblastic pigmented cells in samples sent to Pearson; and discussion of presence of pigment granules; Pearson's thoughts on his Epicanthus paper; and corrections to the proofs. 1914-1935