Die Prinzipien der Biologie . eir Positionen erlauben. Daher muss das Überleben des Installateuren dazu tendieren, immer wieder Typen zu etablieren, in denen diese Individuen einander mehr unähnlich sind, zum Zeitpunkt der Zeit, in der ihre verschiedenen Individualitäten durch die Integration infolge ihrer Mutualabhängigkeit stärker deguisiert werden. Da es sich also um die Vorwegnahmen handelt, die von den Generallaws der Evolution gerechtfertigt sind, müssen wir jetzt nachfragen, ob es sich dabei um Tiere handelt, die diese erfüllen. Nur sehr wenig Suchen; für Strukturen der zu erwartenden Art sind abundant. In dieser großen Spaltung des Tierreiches CalledAnnulosa

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The principles of biology . eir positions permit. Hence, survival of thefittest must tend continually to establish types in which theconnected individuals are more unlike one another, at thesame time that their several individualities are more dis-guised by the integration consequent on their mutualdependence. Such being the anticipations warranted by the generallaws of evolution, we have now to inquire whether thereare any animals which fulfil them. Very little searchsuffices ; for structures of the kind to be expected are abund-ant. In that great division of the animal kingdom calledAnnulosa, especially if the Annuloida be regarded as part of THE MORPHOLOGICAL COMPOSITION OF ANIMALS. 91 it, we find a variety of types having the looked-for charac-ters. Let VIS contemplate some of them. § 205. An adidt Annelid is composed of segments whichrepeat one another in their details as weU as ia their generalshapes. Dissecting one of the lower orders, such as isshown in Fig. 160, proves that the successive segments, be-. sides having like locomotive appendages, like branchis, andsometimes even Kke pairs of eyes, also have like internalorgans. Each has its enlargement of the aHmentary canal;each its contractile dilatation of the great blood-vessel; eachits portion of the double nervous cord, with ganglia whenthese exist; each its branches from the nervous and vasculartrunks answering to those of its neighbours; each its simi-larly answering set of muscles; each its pair of openingsthrough the body-wall; and so on throughout, even to theorgans of reproduction. That is to say, every segment is ingreat measure a physiological whole—every segment con-tains most of the organs essential to individual life and miJ-tipKcation: such essential organs as it does not contain, being those which its position as one in the midst of a chain, prevents it from having or needing. If we ask what is the meaning of these homologies, no adequateanswer is supplied by any current hypothesis. That th

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• bookcentury1800
• bookdecade1860
• bookyear1864
• buchsubjektbiologie