1916] Chandler: Structure of Feathers 395 
NitzscuH, C. L. 
1867. Pterylography. Edited and revised by H. Burmeister, trans. from 
the German and edited by P. L. Sclater. Ray Soc. Publ., 10, 
181, 10 pls. 
PARKER, T. J. 
1891. Observations on the anatomy and development of Apteryz. 
Philos. Trans. R. Soc. London, 182B, 25-134, pls. 3-9. 
PEARL, R. 
1907. Variation and differentiation in Ceratophyllum. Carnegie Inst. 
Wash. Publ. 58, 1-136, 26 figs. in text. 
PERNITZA. 
1871. Bau und Entwickelung der Erstlingfieders. Sitzungsber, Kais. Ak. 
Wiss. Wien., 43, Abth. 2, 439-449. 
Pycrart, W. P. 
1893. The interlocking of the barbs of feathers. Nat. Sci., 3, 197-203. 
1909. A history of birds. (London, Methuen), xxxi + 458, 36 pls., 50 figs. 
in text. 
RIDDLE, O. 
1908. The cause of the production of “down” and other downlike struc- 
tures in the plumages of birds. Biol, Bull., 14, 163-175. 
Stusss, F. J. 
1910. An undescribed feather element. Nature, 84, 328. See also p. 436. 
SCHLEIDT, J. 
1913. Ueber Frtihstadien der Entwicklung von Schuppe und Feder. 
Arch. f. mikr. Anat., 83, 118-129, pl. 7. 
SCHROEDER, R. 
1880. Pterographische Untersuchungen. Diss. Inaug., Halle. 
STEHLI, G. 
1910. Ueber die Beschuppung der Reptilien. Jen. Zeitsch., 46, 737-801, 
pl. 28, 19 figs. in text. 
Strona, R. M. 
1902. The development of color in the definitive feather. Bull. Harvard 
Mus. Comp. Zool., 40, 147-186, 9 pls. 
1903a. Iridescent feathers. Science, n. s., 17, 483-484. 
1903b. Metallic colors of feathers from the side of the neck of the do- 
mestic pigeon. Mark Anniv. Vol., 263-277, 1 pl. 
1805. The evolution of color-producing structures in birds. Science. n. s., 
21, 380-381. 
STUDER, T. 
1873. Die Entwicklung der Federn. Inaug. Diss., Bern., 29 pp., 2 pls. 
1878. Beitrage zur Entwicklungsgeschichte der Feder. Zeitsch. f. wiss. 
Zool., 30, 421-436, pls. 25-26. 
SUNDEVALL, C. J. 
1886. On the wings of birds. Ibis, (5), 4, 389-457, pls. 10-11. 
Totpt, K. JUN. 
1912. Beitrage zur Kenntnis der Behaarung der Saugetiere. Zool. Jahrb., 
Abt. fiir Syst., 33, 9-86, pls. 2-3. 
WIEDERSHEIM, R. 
1909. Vergleichende Anatomie der Wirbelthiere (Ed. 7; Jena, Fischer), 
xx + 935, 1 pl., 476 figs. in text. 
