ONE PLATE (ONE FIGURE)In former investigations Loeb (1897) studied the autogen017s transplantation of pigmented ear skin into defects of white skin in the ears of guinea pigs. These investigations were continued by Sale ( W ) , Seelig ( '13), and by Saxton, Schmeckebier and Kelley ('36). It was shown that the pigmented epidermis, or a t least certain of its constituents, invaded adjoining areas of the white epidermis, and it was only after a consideralde period of time that this invasion came to a conclusion.There remained tlie question as to whether the invading transplanted epithelium replaced the neigliboring host epidermis in its entirety, or whether it was merely the chromatophores of the pigiiieiited transplant which moved into the adjoining white epiderniis and supplied the latter with melanin granules. It appeared possible to answer this question experinleiitally. This possibility was based on the fact that the ear and dorsal skin of the guinea pig differ in thickness under normal conditions. By replacing the thin dorsal skin with the thicker ear skin, and vice versa, the secondarily pigmented skin in the surrounding host tissue should assume the cliaracteristic thickness of the traiisplunted skin and
The southeastern United States contains a great variety of microcaddisfiies. More than 90 species in 12 genera are known to occur in this region and additional collecting will undoubtedly reveal many new species.
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