. The Wilder quarter-century book: a collection of original papers dedicated to Professor Burt Green Wilder at the close of his 25th year of service in Cornell University (1868-1893). Wilder, Burt G. (Burt Green), 1841-1925; Zoology; Anatomy; Physiology; Evolution; African Americans. Evolution and Taxonomy 71 brane of the wing is supplied with an immense number of mi- nute tracheae extending from the main trunks contained in the veins. The lateral branches of the trachese are rarely seen even in carefull}' bleached wings, for in mounting the speci- men they become filled with the mounting medi
. The Wilder quarter-century book: a collection of original papers dedicated to Professor Burt Green Wilder at the close of his 25th year of service in Cornell University (1868-1893). Wilder, Burt G. (Burt Green), 1841-1925; Zoology; Anatomy; Physiology; Evolution; African Americans. Evolution and Taxonomy 71 brane of the wing is supplied with an immense number of mi- nute tracheae extending from the main trunks contained in the veins. The lateral branches of the trachese are rarely seen even in carefull}' bleached wings, for in mounting the speci- men they become filled with the mounting medium and are thus rendered invisible. But occasionally air will remain in them rendering them distinctly visibly. It is by means of .some of these lateral tracheae that the branches of media be- come connected with radius and with cubitus. When such a communication has been established it is im- portant that tracheae should not be compressed by the. K vm Fig. 16.—Packardia. bending of the wing during flight, therefore any tendency to protect these tracheae by a thickening of the membrane along their would be beneficial and would result in the de- velopment of veins enclosing these tracheae. These veins at first extend in a direction, and are thus cross veins (Fig. 16, c. v.). But the result of. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilder, Burt G. (Burt Green), 1841-1925. fmo; Jordan, David Starr, 1851-1931. ins; Comstock, John Henry, 1849-1931. ins; Dudley, William Russel, 1849-1911. ins; Corson, Eugene Rollin, b. 1855. ins; Gage, Simon Henry, 1851-1944. ins. Ithaca, N. Y. , Comstock
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