Abstract
IN the text-books on practical zoology in common use in zoological laboratories, the method advocated for making preparations of the contents of the vesiculæ seminales of the earthworm for the examination of the stages in the life history of Monocystis is what is usually known as the cover-glass method (vide Marshall and Hurst, “ Practical Zoology,” 9th edition, p. 13). It is, I believe, a matter of common experience that, when this method is adopted, only a small percentage of the students succeed in finding in their own preparations all, or even the majority, of the important stages. Generally only the trophozoite and sporocyst stages are found, and demonstration specimens have to be resorted to to fill in the gaps.
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GROVE, A. A Method for Demonstrating the Stages in the Life History of Monocystis in Practical Class Work. Nature 112, 397 (1923). https://doi.org/10.1038/112397a0
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DOI: https://doi.org/10.1038/112397a0
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