The Science record; a compendium of scientific progress and discovery . Fig. 472 SCIENCE RECORD. ket, showing the eggs within ; i to 11 are feet, serving bothfor purposes of respiration and propulsion ; a b is the ab-domen, and a p the caudiform appendage ; c\% the diges-. Fig. tube, colored red by the contained monads. It is acurious fact that the young are produced by parthenoge-nesis, and are always females. SEVEN THOUSAND LIVING SHELL interesting experiment has lately been made inScotland, under the auspices of the Perthshire Society ofNatural Science, in the way of acc
The Science record; a compendium of scientific progress and discovery . Fig. 472 SCIENCE RECORD. ket, showing the eggs within ; i to 11 are feet, serving bothfor purposes of respiration and propulsion ; a b is the ab-domen, and a p the caudiform appendage ; c\% the diges-. Fig. tube, colored red by the contained monads. It is acurious fact that the young are produced by parthenoge-nesis, and are always females. SEVEN THOUSAND LIVING SHELL interesting experiment has lately been made inScotland, under the auspices of the Perthshire Society ofNatural Science, in the way of acclimatizing sundry spe-cies of land-shells, about seven thousand living specimensof Helix virgata, Helix ftisana, and Bulimus acutus havingbeen turned out during the summer of 1872. NATURAL HISTORY AND ZOOLOGY. 473 THE SHARK AND FRIENDS. The shark is always attended by a small blue pilot-fish,which swims about live yards in front of him, and evident-ly guides him and warns him of danger, his unwieldy sizeand length making it difficult for him to turn. The pilot-fish appears to do his kindly offices from pure friendship,with no filthy lucre of gain ; but he probably benefits insome way by the leavings of his great ally, or the small frywhich gather round a dead prey.
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