1869.] 



Yellow Oryanic Substances. 



255 



elegans, (32) Allamanda Hendersonii ; (33) the root of the common 

 carrot, Daucus carota ; (34) the seeds of Indian corn, Zea mays. The 

 extracts of the berries of the following plants also give the luteine spec- 

 trum : — (35) Anatto; (36) Asparagus; (37) Physalis Alhehengi (outer 

 shell and inner berry) ; (38) Solanum dulcamara ; (39) Solanum capsi- 

 castrum; (40) Cyphomandra betacea ; (41) Cratcegus crus-galli; (42) 

 Pyrus aria. 



12. Uncertainty . — In several of these matters only two absorption -bands 

 are with certainty distinguished. The third, clearly observable e.g. in 

 the extract from the common marigold, requires further researches with 

 more powerful light. 



13. Yellow Bodies with one Band. — The yellow principles contained in 

 yellow-wood or fustic, in the flowers of the Calceolaria of ornamental 

 gardens, and in the yellow feces of sucking infants, show but one absorp- 

 tion-band, in the blue. 



14. Uranium Salts. — The yellow solutions of uranium salts exhibit two 

 absorption-bands in the blue, which are very different from any of the above 

 bands. 



15. Spectra of Yellow Bodies with continued Absorption of Blue. — A 

 great number of yellow substances, amongst them some of the most im- 

 portant dye-stuffs, show spectra with continued absorption of blue, indigo, 

 and violet, without any bands. On dilution the absorption gradually 

 recedes towards violet. To this class belong (1) Rhamnine, from French 

 berries ; (2) Luteoline, from weld ; (3) Quercitrine, from extract of quer- 

 citron or fluorine ; (4) Turmeric ; (5) Picric, and (6) Purree, or Indian 

 yellow; the orange-coloured solution of the petals of (7) Coreopsis lanceo- 

 lata, (8) Helichrysum bracteatum ; the light-yellow solution of (9) Viola 

 lutea s (10) Acacia decurrens, (11) Helianthus macrophyllus (?), (12) 

 Berberis Darwinii (?), (13) Gnaphalium foetidum. 



16. Luteine not identical with Hematoidine or Cholophceine. — Luteine 

 differs entirely from hematoidine on the one, and from cholophseine on the 

 other hand, and ought not, and after the elucidation of its spectral pheno- 

 mena cannot, any longer be confounded with either of them. 



17. Error of St'ddeler and Holm. — The bodies described by Holm and 

 Stadeler under the name of hematoidine are not hematoidine, but luteine. 



18. Robin's Hematoidine is Cholophceine. — The bodies described by Va- 

 lentiner, and by Robin, Riche, and Mercier, under the name of hematoidine, 

 are not hematoidine, but cholophaeine or bilirubine. 



19. Hematoidine peculiar. — Hematoidine is a useful expression for 

 certain microscopical crystals and amorphous bodies occurring in effused 

 blood, the substance of which has not as yet been chemically isolated or 

 defined. 



20. Luteine leads to new morphological views.— The discovery of the 

 identity of luteine from corpora lutea of mammals with that from yelks of 

 eggs will probably lead to a revision of the present doctrines regarding the 



