First lesson in zoology : adapted for use in schools . -A Fio. JS.—Parameci-um caudatum. from the dor-sal side magniBed160 diameters. P,the taU; T, thethroat; A, the pos-terior opening ofthe digestive cavi-ty; CV, the anter-ior, and Cv, pos-terior contractilevesicles; N, a solidcentral mass or nu-cleus; V, the largevibratUe cilia atthe edge of themouth: F, massesof

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894