NOTES ON THE CHROMATOLOOY OP ANTHEA CEREUS. 579 



the accompanying drawing, an inspection 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 my results with those of Krukenberg, the 

 difficulty at once is encountered of attempting to find out what 

 bands 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 

 1 ' Philos. Trans.,' loc. cit. 



