Definition of "chromatic"

Each nucleus has, then, (1) a protoplasmic body, and (2) a portion formed of nuclein, which is the chromatin of [Walther] Flemming. […] The chromatic reticulum of Flemming is only an appearance due to the regular crossing of its convolutions, rarely to their temporary union.

1887 December 14, John Gray M‘Kendrick [i.e., John Gray McKendrick], “IV.—On the Modern Cell Theory, and the Phenomena of Fecundation.”, in Proceedings of the Philosophical Society of Glasgow, volume XIX, Glasgow: Published for the [Philosophical] Society [of Glasgow] by John Smith and Son, […], published 1888, page 84

The chromatic threads next arrange themselves in the equatorial plane of the nucleus, and then divide into two groups of threads, each of which forms a daughter nucleus.

1889 September, Harold W[illiam] T[aylor] Wager, “4. Observations on the Structure of the Nuclei in Peronospora, and on Their Behaviour during the Formation of the Oosphere.”, in Report of the Fifty-ninth Meeting of the British Association for the Advancement of Science Held at Newcastle-upon-Tyne in September 1889, London: John Murray, […], published 1890, section D ([Transactions of the Biology Section]), page 619

Prof. [Sydney Howard] Vines also attacks my view of the idioplasmatic nature of the nuclear substance (the chromatic grains); and maintains that it is as easy to speak of the continuity of the cell-body as of that of the nuclear substance, and that the one may transmit heritable qualities to progeny as well as the other.

1890 February 6, [August] Weismann, “Prof. Weismann’s Theory of Heredity”, in Nature: A Weekly Illustrated Journal of Science, volume XLI, number 1058, London, New York, N.Y.: Macmillan and Co., page 320, column 2

If we are amazed at the precision with which the chromatic elements of the nucleus are divided and distributed, we can be no less astonished at the wonderful directive influence exercised by the asters upon the nuclei; […]

1893, E[dwin] G[rant] Conklin, “Second Lecture. The Fertilization of the Ovum.”, in Biological Lectures Delivered at the Marine Biological Laboratory of Wood’s Holl[sic – meaning Hole] in the Summer Session of 1893, Boston, Mass.: Ginn & Company, published 1894, page 29