On Spectrum Analysis as Applied to Microscopical Observation - The Subject of a Lecture Delivered at the South London Microscopical and Natural History Club, April 9, 1872 #231078

Honorary Reporter of the South London Microscopical4 preface. Club, for his careful transcript of the subject-matter of the original leéture; to Messrs. West's establishment, for the assistance rendered in the execution of the lithographic illustrations; and to Mr. Browning, for the opportunity of examining several specimens, and for his kind assistance.