. The study of animal life [microform]. Zoology; Zoologie. â I alii 1*. ⢠I 70 T/t£ Study of Auimal Life PAR r I result from the fact that in such a large colony perfect uniformity of nutritive and other conditions is impossible. Individuals which are fundamentally and originally like one another grow to be different, and perform different func- tions according to the caste t > which they belong. Many are nutritive in form like the little freshwater Hydraâiv\m\7cc animals with an extensile body and with .1 terminal mouth wreathed round by mobile tentacles. On these the whole nutrition of
. The study of animal life [microform]. Zoology; Zoologie. â I alii 1*. ⢠I 70 T/t£ Study of Auimal Life PAR r I result from the fact that in such a large colony perfect uniformity of nutritive and other conditions is impossible. Individuals which are fundamentally and originally like one another grow to be different, and perform different func- tions according to the caste t > which they belong. Many are nutritive in form like the little freshwater Hydraâiv\m\7cc animals with an extensile body and with .1 terminal mouth wreathed round by mobile tentacles. On these the whole nutrition of tlie colony depends. Beside the>e there are reproductive " per- sons," which cannot feed, being mouthless, but secure the continuance of the species and give rise to embryos which start new colonies. Then there are Ion,;, lank, sensitive mem- bers, also mouthless, which serve as the sense-organs of tlic colony, and are of use in tlc- tccting food or danger. Wht 11 danger threatens, the polypo cower down, and there are IcU projecting small hard spines, which some regard as a fourtli Fig. of ,act!,.;; c> ^, .^i i »i i _ i abortive spines; and there are thoms On the hawthom hed^e. .ilso louK mouthlps j^ rccognising their utility to specialised m sensitiveness. (From ° ° ' charnVjers's h'.ncyciop.; .iftcr All- the colony as a whole we can '"'"'>⢠hardly overlook the fact that their life as individuals is prarticaliy nil. trate the dark side of division of They well illus- i! â I Ilcriwrt .^pcnrer .nnd Krnst Ilacckel Imve cxiilnincl voiy one of jir )j^rcss aiiionif those animals \v)iich form colonics. 'I'lio crmlo form nf a colciy is an ai,'::,'rij;aU of siniilat inilivi(^, the perfected colony is an intcip-aie in wliich by division of lalimir greater harmony of life li > resulted, and in which the whole colony is more thoroughly compacted into a unity. Among the Stinging- :
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
