. Bulletin. Natural history; Natural history. May 1937 BROWN: COLOR RESPONSE OF LARGE-MOUTH BASS 37 were obtained by dipping the tape- covered pipettes into black Inciia ink ot different dilutions. Paraffin was applied to the dried outer surface ot the pipettes. Black 7 was the result of rubbing a covered pipette with a black wax crayon and then paraffining it. Measurements of the relative light reflection of these gray pipettes were made with a MacBeth illuminometer. A petri dish filled with water was placed upon a milk glass plate and 2 inches above the surface of the water the illu- minomet
. Bulletin. Natural history; Natural history. May 1937 BROWN: COLOR RESPONSE OF LARGE-MOUTH BASS 37 were obtained by dipping the tape- covered pipettes into black Inciia ink ot different dilutions. Paraffin was applied to the dried outer surface ot the pipettes. Black 7 was the result of rubbing a covered pipette with a black wax crayon and then paraffining it. Measurements of the relative light reflection of these gray pipettes were made with a MacBeth illuminometer. A petri dish filled with water was placed upon a milk glass plate and 2 inches above the surface of the water the illu- minometer was directed in such a manner that light, emitted from a light source making an angle of 60 degrees with the water surface, was reflected up into the illuminometer at the same angle, fig. 3. The pipettes were lowered one by one just beneath the surface of the water of the petri dish and the re- lative values ot the light reflected from the side ot each was measured. The relative brightnesses of the pipettes as measured by this method were as follows: White 0 63 Gray 1 49 Gray 2 32 Gray 3 26 Gray 4 21 Gray 5 15 Grav 6 7 Black 7 1 It is thus seen that the range ot in- tensity of the gray pipettes was con- siderable and it was very reasonable to expect that it would cover the range of intensities of the colors used. From a good quality, 1 mm. thick, water-color board, small 6 by 65 mm. strips were cut. Twenty-eight of these were painted with water colors in such a way that the strips could be arranged into a complete visible spectrum divided into 28 grades of color of roughly equal degrees of difference. The stages were made by imitating the pure spectral colors given by Ridgway in his "Color Standards and Color ; The colored paper rods were finally dipped in warm paraffin to render them waterproof and to obviate any possible { odor ot the pigments. The paraffin coating had practically no detrimental effect as far as changing the original color was concer
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
