. A dictionary of birds . B will see it bright copperyred, and at C rich green; the metallic feathers of the sides of thebreast in the same bird will change from black to green at B, andto blue at C. The beautiful Pharomacrus mocinno changes fromgreenish bronze through golden green, green, and indigo to chimborazo in position B exhibits the whole solarspectrum, namely, violet and red on the head, followed by orangeand green on the back, blue, violet, and lastly purple on the ^ In Pitta moluccensis I calculated the following measurements: width ofune polygon OOOl mm., heigh
. A dictionary of birds . B will see it bright copperyred, and at C rich green; the metallic feathers of the sides of thebreast in the same bird will change from black to green at B, andto blue at C. The beautiful Pharomacrus mocinno changes fromgreenish bronze through golden green, green, and indigo to chimborazo in position B exhibits the whole solarspectrum, namely, violet and red on the head, followed by orangeand green on the back, blue, violet, and lastly purple on the ^ In Pitta moluccensis I calculated the following measurements: width ofune polygon OOOl mm., height of same 0015 mm., thickness of its transparentcoating about 0-0012 ; distance between two of the longitudinal ridges on thesurface of the poljgon 0-0005, tliickness of the transparent outer layer of theradius about 0-005 mm. 98 COLOUR long tail feathers. The red colours of the spectrum lie nearertowards the position A, the Line colours towards C. The coloursalways apjiear in the same order : no feathers are known, which. Positions for observino the Colour of Metallic Feathers.(From the rrucecduujs of the Zoological Society, 18S2.) when looked at from B towards A, change from the i-ed towardsthe hlue end of the spectrum. In case two or more of these spectra(of which we imagine the horny coating to be composed) overlap eachother, only a limited number of colours are able to reach the eyeof the observer. Thus in the theoretical case figured red only willbe visible besides black. A peculiar case is that of Artamia bicolor; the j)ure white feathers
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1896
