Appendix, regarding 'Preliminary notes on the photographic spectrum of comet b 1881' by William Huggins Huggins relays information about the photographic spectrum of the comet, observing 'for the two strong bright lines the wavelengths 3883 and 3870'. Affiliated paper listed as 'wanting' in the index (see PP/1/43). Subject: Astronomy Received 11 July 1881. The appendix and affiliated paper were published in volume 33 of the Proceedings of the Royal Society as 'Preliminary note on the photographic spectrum of comet b 1881'. 9 July 1881