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The development of ascaris eggs, especially those of Ascaris megalocephala, was precisely studied by T. Boveri.4) He cleared the mode of cleavage and formation of embryo. Several detailed reports9) have also been published on chromosomes of ascaris egg mainly in pref ertilization stadium . However, the cytological and embryogical studies on ascaris eggs after fertilization seem to be relatively5) 6) 7) few. The ascaris eggs has fairly strong registance against chemicals as previously reported by the author17)8), and it also reveals fair resistance against common fixative solutions. As the egg-cell contains many fatty granules, some special treatment such as freezing technic is indispensable for the preparation of samples. For the observation of the development of ascaris eggs, the present author applied both smear and sectioned specimens.

japanese journal of medical science and biology/japanese journal of medical science and biology

BIOLOGICAL STUDIES ON ASCARIS EGGS IV. ASCARIS ONTOGENESIS OBSERVED BY NUCLEIC ACID STAININGS, AND DISTRIBUTION OF FAT OR GLYCOGEN FOLLOWING THE DEVELOPMENT OF ASCARIS EGGS