. Beginners' Zoology . %^^ Fig. 173. — Metamorphosis of flea. Fig. 172. — Metamor-phosis of house-fly(enlarged).. Fig. 174. — Louse andits eggs attached to ahair. Natural sizeand magnified.

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Keywords: ., bookcentury1900, bookdecade1920, bookidbeginnerszoo, bookyear1922