Notes on the chromatology of Anthea cereus / by C.A. Mac Munn.

  • MacMunn, Charles Alexander, 1852-1911.
Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: Notes on the chromatology of Anthea cereus / by C.A. Mac Munn. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    9/24 (page 7)
    the accompanying drawing, an inspeclion of which alone will convince most people that these bodies are not secreting cells (PI. XXXIX). Results of Spectroscopic Examination.—The chloro- phyll of Anthea differs from other chlorophylls in its remark- able instability towards caustic alkalies; this I have already described/ and the chlorofucin which accompanies it is also remarkably unstable. I propose first to describe the results of an examination of the solutions of these pigments, and then to compare them with plant chlorophyll. In comparing ray results with those of Krukenberg, the difficulty at once is encountered of attempting to find out what bauds of his correspond with mine, as in all his early maps the Fraunhofer lines occupy the wrong position, and none of his measurements have been given in wave lengths. Still it is not difficult to see that the pigments met with by him do not differ from those here described, and if this be the case it is easy to say which are the bands of chlorofucin and which of chloro- phyll, &c, in his drawings, as I shall show further on. I now proceed to describe the results of an examination of the colouring matters of Anthea. All the specimens which I examined have been of a dull greenish colour and therefore are of the same colour as those examined by Sorby. The tentacles were removed from several specimens and put into absolute alcohol after washing with water, this I may call solution (1). The other parts without the tentacles were cut up small, washed-with water, and also put into absolute alcohol; this I may call solution (2). In both cases the absolute alcohol was left in contact with the parts for three days or longer in a dark place. The colour of solution (1) was greenish yellow, and it had a red fluorescence and gave in a certain depth sp. 1, while in a shallow layer a band became detached in the violet end of the spectrum, which I have tried to represent by sp. 2; but it must be remembered that this band may not be exactly repre- sented owing to the difficulty of seeing it, even by the help of