To illustrate this point graphically so as to avoid as far as possible future confusion Figure 29 is appended. In _a_ is shown a particle traveling on an ameba at the same rate of speed as the ameba; at _b_ is shown a particle that moves twice as fast as the ameba; at _c_ the attached heavy particle does not move at all. For the sake of completeness _d_, Figure 29, is added here. It illustrates the backward moving ectoplasm in an ameba that is suspended in a jelly medium that prevents the ameba from sinking to the bottom. It must be admitted that in thus considering the rate of movement of the various tissues of the ameba from a single standpoint, a point outside of the ameba, little room is left for confusion. [Illustration: Figure 29. _a_, a particle attached to an ameba and moving at the same rate as the ameba. This condition is often observed in _proteus_ where the surface film, owing to its destruction during the formation of the longitudinal ridges, retards the forward movement of this layer. _b_, a particle attached to the surface film of an ameba moving twice as fast as the ameba. This condition is seen in _discoides_, _verrucosa_, _sphaeronucleosus_, etc. _c_, a particle on an ameba that does not move at all although the ameba does. This is seen when a heavy particle is laid on an ameba, too heavy for the surface film to move. _d_, movement of ectoplasm in an ameba suspended in a jelly medium. The vertical lines are to be considered as stationary.] There is comparatively little friction, if any at all, between the upper surface and the endosarc, according to Jennings’ view, since both these layers move at the same rate and as a single stream. On the other hand there must be very considerable friction between the endoplasm and the lower ectoplasm, which does not move at all. This difference in the amount of friction must show itself in the different speeds of the endoplasm near the upper ectoplasm and near the lower ectoplasm. Observation indicates however that the most rapid streaming of the endoplasm is in the middle of the ameba or pseudopod and that it gradually becomes slower as the ectoplasm is approached on _all sides_.