of R. 22, 0. 16, N. 62, the material is still a little richer in color than can be made with the disks of the color wheel. If we introduce a small amount of white into the brown of the material we may hope to match it with the disks and this may be clone by cutting a bit of fairly heavy white paper in the form shown in the diagram and loosening the nut of the color wheel slightly, after which we insert the point of the triangle under the nut so that when tightened the white paper may be held in front of the brown disk, as in the illustration. Trim the outer end even with the disk and then rotate. If the effect of the white is too great trim off a little from the side of the white paper to make it narrower, until a perfect match is secured.
The small disk in rotation is then of the same color but not quite so intense as before, or in other words, is a very deep tint of the color. In this way the Nomenclature can be recorded as follows: Brown 95, W. 5, R. 22, O. 16, N. 62.
This result does not often occur, but the subject is noticed here in detail that no one may be in doubt when such cases do come to light, as they will sooner or later.
The aniline colors give some purples which are much more brilliant than either the violet or reel which otherwise should by combination produce them, so that with these standards they cannot be made, but must be reduced with white, or possibly with white and black.
If a color wheel is not available many of these experiments may be tried on the color top, but not as satisfactorily, because of the accuracy necessary in cutting so small a disk in a woven material. In using the top for analysis of all ordinary colors, the best plan is lay the material on a table or other level surface and spin the top on it. If quite an accurate test is desired the cardboard disk of the top may be trimmed clown to the size of the largest paper disk, so that there will be no intervening ring of light color to separate the color of the rotating disks from the material on which it is spun.
Practical applications of the color top are already being
