When, however, a plate of quartz is used in this experiment, the light is coloured and is in no case cut off by the analyser, the tint, however, changing as the analyser is rotated.
A strong sense of duty, genuine piety, and a cautious but by no means pusillanimous common-sense coloured every action of his patient, laborious and eventful life.
In the years of war that followed, a very large proportion of the able-bodied men of the state served in the armies of the Confederacy; several regiments, some of coloured troops, served the Union.
The early practice of writing the initial lines or even the entire text of a volume in gold or coloured inks, and of staining with purple and of gilding the vellum, while it undoubtedly enhanced the decorative aspect, does not properly fall within the scope of this article; it concerns the material rather than the artistic element of the MS. (See Manuscripts, Palaeography.) It will be seen, then, that in the earliest examples of book decorations we find the germs of the two lines on which that decoration was destined to develop in the illuminated MSS.
We have in the work of the monk Theophilus, Diversarum artium schedula, and in the probably earlier work of Eraclius, about the iith century, instructions as to the art of glass-making in general, and also as to the production of coloured and enamelled vessels, which these writers speak of as being practised by the Greeks.
The proportions in which the various coloured individuals appear are approximately those demanded by the Mendelian principle of gametic purity and segregation.
I have refracted it with Prismes, and reflected it with Bodies, which in Day-light were of other colours; I have intercepted it with the coloured film of Air interceding two compressed plates of glass, transmitted it through coloured Mediums, and through Mediums irradiated with other sorts of Rays, and diversly terminated it; and yet could never produce any new colour out of it.
It is possible that this resemblance is mimetic in the Batesian sense of the word, and that the Poecilogale, if inoffensive, profits by its likeness to the highly offensive and warningly coloured Ictonyx.
Andrea, founded in 1093, still preserves the lower part of the original arcaded facade in black, white and coloured marble.
The fulness and accuracy of the text, combined with the neat beauty of its coloured plates, have gone far to promote the study of ornithology in Germany, and while essentially a popular work, since it is suited to the comprehension of all readers, it is throughout written with a simple dignity that commends it to the serious and scientific. Its twelfth and last volume was published in 1844 - by no means too long a period for so arduous and honest a performance, and a supplement was begun in 1847; but, the editor - or author as he may be fairly called - dying in 1857, this continuation was finished in 1860 by the joint efforts of J.