The laws and mechanics of circulation, with the principle involved in animal movement . room in-vokes the force of external pressure for compelling it into INTRODUCTION OF SOLID FOOD. 51 the body. And from the moment it starts upon the journeytill it reaches its destination, such is the case. And one morselafter another being thus taken in, when the amoeba is madeto eat, the limit in expansion is finally reached when no morefood can be taken into the body, a circumstance, indeed, whichis forcibly illustrated in a higher stage in development, e. g.,the gorged leech (Pig. 17). But we will not an
The laws and mechanics of circulation, with the principle involved in animal movement . room in-vokes the force of external pressure for compelling it into INTRODUCTION OF SOLID FOOD. 51 the body. And from the moment it starts upon the journeytill it reaches its destination, such is the case. And one morselafter another being thus taken in, when the amoeba is madeto eat, the limit in expansion is finally reached when no morefood can be taken into the body, a circumstance, indeed, whichis forcibly illustrated in a higher stage in development, e. g.,the gorged leech (Pig. 17). But we will not there is a mouth, however (Ciliata), this is expandedwhen brought in contact with the food, pressure, of course,forcing it in simultaneously, whence it passes into the softparenchyma as previously, as there is no enteric tube for con-veying the food masses, the parts again contracting and closingover it. Indeed, the powers of expansion possessed by theselow organisms is something extraordinary, some of the moreravenous infusoria, for example, actually swallowing other. Fig. 10.—Actinosphserum (Gegenbaur). a, A morsel which has been taken in as food,and just pushed into the soft cortical layer b, by a change in pressure; c, centralparenchyma ; d, other food which had previously been thus introduced ; e, pseudo-podia of the cortical layer. infusoria nearly as large as themselves. The mouth beingbrought in contact with the prey, is suddenly expanded uponit, which at once develops a suction force for compelling it intothe cavity, when the mouth contracts again for completingthe act. Other infusoria (Suctoria) possess hollow radiateprocesses (Fig. 11, p. 55), which pass through the envelope of thebody and function as suckers, so to speak, and which aremade to penetrate the body of other infusoria for aspiratingthe fluids into themselves, flowing into them in the form ofdrops, thus feeding upon the juices of the victim simply, notpossessing a mouth. But for aspirating
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