36 Chadbourne on Individual Dichromatism. Ffai!' 



and r, fig. 5, and cut in text). In the white parts of the vane,'the 

 only color was a pale straw-yellow almost entirely limited to the 

 outer (peripheral) cellular tissue, and probably caused by the 







Two Barbs from near A., pi. I, fig. i. Groups of dark colored cells are seen 

 in some parts of the barbs. (Zeiss i6mm. apochromat. and No. 6 comp. oc.) 



homogeneous stain (Plate I, fig. i). The downy parts of the con- 

 tour feathers had nodular enlargements at regular intervals, in 

 which the coloring matter was usually collected (Plate I, fig. 4, <•/); 

 in other specimens the nodes were almost colorless, and the inter- 

 nodes pigmented (Plate I, fig. \,a). There seems to have been an 

 absolute loss of black, as well as of the darkest brown granules 



