. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 24 Dfo & the Rev. S. Graham Brade-Birks— In G. carpophagiis, tlien, iTiorc tliati oiio type of inland is present, and one of these has been sliown to excrete a substance almost certainly essential for the production ot" the animaFs light. Thus upon such stimulation as results in the ordinary production of light there are present on tlie ventral snrface of the body : tlie contents of the white glands ; and, almost certainl}', always the contents of at least one other t
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 24 Dfo & the Rev. S. Graham Brade-Birks— In G. carpophagiis, tlien, iTiorc tliati oiio type of inland is present, and one of these has been sliown to excrete a substance almost certainly essential for the production ot" the animaFs light. Thus upon such stimulation as results in the ordinary production of light there are present on tlie ventral snrface of the body : tlie contents of the white glands ; and, almost certainl}', always the contents of at least one other ty[)e of glaid ; and air, with its ordinary impurities inclu<ling water- vapour. We do not know enough of the chemical nature of the contents of the individual glands yet to speak confidently, but we can at least concliule thiit in the excretion whicii accompanii'S luminosity there arc generally [irescnt : (i.) the I^^ig. 16,. Enlarged view of some glands of the same section, X 160. Lettering as in fig. 15. H. K. del. contents of the white glands ; for these we propose the name of protoluciferin ^, (ii.) mucin, (iii.) acid. The last two may, or muj not, be produced by the same gland, and in either case protolucifer-in may, or may not, contain acid as well. We may now examine more closely, from the chemical point of view, the conditions and incidence of luminosity in G. carpophagus. * Zncifen'ti, tlie nniue proposed by Dubois for the luminous fluid he met with in Ori/n hdibarica, includes tlie whole excretion of the ventral surface and probably includes mucin and an acid, apart from any sub- stance corresponding to our Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Taylor and Francis, Ltd
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