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In connection with the experimental study of adaptation, it is essential to make use of comparative measurements on the widest possible scale. As an index of modification in the leaf, in terms of both growth and structure, stomata have been found to possess peculiar advantages. They have received increasing attention in consequence, and it has become important to reexamine critically the various methods for viewing them. In earlier investigations extensive use had been made of epidermal strips supplemented by direct observation (Folsom, 1918; Loftfield, 1921), but even at its best this procedure was too time-consuming for the scrutiny of hundreds of species and forms. Furthermore, it could be applied only with difficulty or not at all to many types of leaves and but rarely permitted obtaining continuous standards from base to tip or from margin to margin. In this juncture, recourse was taken to the employment of films of collodion, with the primary purpose of increasing the rapidity of operation and the range of application. This method had already received incidental attention in connection with ecological studies at the Alpine Laboratory and offered promise of greater development.Buscalioni and Pollacci (I<)02) were apparently the first to employ collodion for securing impressions of the epidermis, though the idea was derived from Berry (1891), who first utilized it for the study of striped muscle. These two investigators were attracted by the property of collodion films in clouding when moisture is present, and hoped to utilize this as a more definite and localized indicator than cobalt-chloride paper. In spite of the enthusiasm exhibited for the method, the results seem to have fallen far short of expectation, and the procedure was practically lost to view for more than two decades. However, it was employed during this period by Nathorst for fossil impressions (l908a, 1908b) , and also by Naumann (1917). Further applications of the collodion method in this field were made by Lang (1926), Netolitzky (1927), Walton (1928, Barnes and Duerdon (1930), Barnes (1931), and Hoskins (1931). In addition to its use in the adaptation studies mentioned, it has been utilized by Peterson for the stomata of Rumex acetosa (1929), by Ashby for those of Larrea tridentata (1932), and by Wenzl for a series of studies dealing with technique especially (1932 in litt.) METHODS SolutionsSomewhat more than ISO solutions and dilutions, chiefly the latter, have been tested in the endeavor to secure the best for general use, as well as those 7 8 AMERICAN JOURNAL OF BOTANY [Vol. 21,
In connection with the experimental study of adaptation, it is essential to make use of comparative measurements on the widest possible scale. As an index of modification in the leaf, in terms of both growth and structure, stomata have been found to possess peculiar advantages. They have received increasing attention in consequence, and it has become important to reexamine critically the various methods for viewing them. In earlier investigations extensive use had been made of epidermal strips supplemented by direct observation (Folsom, 1918; Loftfield, 1921), but even at its best this procedure was too time-consuming for the scrutiny of hundreds of species and forms. Furthermore, it could be applied only with difficulty or not at all to many types of leaves and but rarely permitted obtaining continuous standards from base to tip or from margin to margin. In this juncture, recourse was taken to the employment of films of collodion, with the primary purpose of increasing the rapidity of operation and the range of application. This method had already received incidental attention in connection with ecological studies at the Alpine Laboratory and offered promise of greater development.Buscalioni and Pollacci (I<)02) were apparently the first to employ collodion for securing impressions of the epidermis, though the idea was derived from Berry (1891), who first utilized it for the study of striped muscle. These two investigators were attracted by the property of collodion films in clouding when moisture is present, and hoped to utilize this as a more definite and localized indicator than cobalt-chloride paper. In spite of the enthusiasm exhibited for the method, the results seem to have fallen far short of expectation, and the procedure was practically lost to view for more than two decades. However, it was employed during this period by Nathorst for fossil impressions (l908a, 1908b) , and also by Naumann (1917). Further applications of the collodion method in this field were made by Lang (1926), Netolitzky (1927), Walton (1928, Barnes and Duerdon (1930), Barnes (1931), and Hoskins (1931). In addition to its use in the adaptation studies mentioned, it has been utilized by Peterson for the stomata of Rumex acetosa (1929), by Ashby for those of Larrea tridentata (1932), and by Wenzl for a series of studies dealing with technique especially (1932 in litt.) METHODS SolutionsSomewhat more than ISO solutions and dilutions, chiefly the latter, have been tested in the endeavor to secure the best for general use, as well as those 7 8 AMERICAN JOURNAL OF BOTANY [Vol. 21,
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