. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 26 MARION A. BROOKS AND A. GLENN RICHARDS. FIGURE 5. Bacteroids (appearing circular in section) forming a peripheral layer under the tunica propria of young oucytes. m = mycetocyte; o = oocyte. Prepared as in Figure 1. FIGURE 6. Mycetocytes (indicated by arrows) appressed to or near the testes of a three- week old nymph. Prepared as in Figure 1. Conclusive results were not obtained from the series of experiments mentioned above because it was impossible to distinguish the effects of the drugs or heat from the effects of the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 26 MARION A. BROOKS AND A. GLENN RICHARDS. FIGURE 5. Bacteroids (appearing circular in section) forming a peripheral layer under the tunica propria of young oucytes. m = mycetocyte; o = oocyte. Prepared as in Figure 1. FIGURE 6. Mycetocytes (indicated by arrows) appressed to or near the testes of a three- week old nymph. Prepared as in Figure 1. Conclusive results were not obtained from the series of experiments mentioned above because it was impossible to distinguish the effects of the drugs or heat from the effects of the loss of the bacteroids. The present study was planned as an extension and elaboration of the works of Brues, Dunn, Glaser, and Noland with the hope that among the newer anti- biotics there would be one more effective in eliminating the bacteroids and yet allow the treated cockroaches to live and reproduce. MATERIALS AND METHODS The German cockroach, Blattclla gcnuanica L., was used primarily because of its short life cycle. Another fact in its favor is its small size, which reduces the expense and labor of making serial sections of whole insects. The original colony was established by catching a few adults in the laboratory building. Females with ripe egg capsules were individually segregated in small cages and the nymphs, upon hatching, were randomly divided and distributed to several matched cages for testing antibiotic and dietary variables. In this way groups of 8 to 10 genetically similar insects were used for comparing sets of 4 differently-supplemented diets. Records were kept of the dates of maturity, the appearance of the first egg capsules, the hatching of the first nymphs, and the death of the individuals of the first generation. The first filial generation was again divided and distributed and similar records kept for them, and in certain cases the second filial generation. Please note that these images are extracted from scanned page images that may have been digit
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
