In another experiment a long animal was made by uniting _Lumbricus rubellus_ (whose posterior third had been cut off) and _Allolobophora terrestris_ (whose first six segments had been cut off). Four days later the two components had torn apart, but a small piece of the anterior worm remained attached to the anterior end of the posterior component. The small piece consisted of the dorsal part of two and a half segments without any ventral part, so that the anterior end of the posterior component was partially exposed. The small piece of lumbricus was much lighter in color, and this difference made it easy to distinguish between the two. In less than a month the small transplanted piece had replaced its missing ventral part, so that the entire anterior surface of the larger component was covered over. The small piece, in addition to regenerating its ventral part of four segments, had also begun to make new segments. After a month and a half six new segments were present (Fig. 52, _E_), with a mouth at the anterior end.[84] Even after ten months the color of the small piece was strikingly different from that of the major component. The new head had the typical red-brown color of _L. rubellus_, that forms a strong contrast to the grayish blue color of _A. terrestris_.[85] The result shows that the color of the regenerated part has not been influenced by that of the posterior component, and this is all the more interesting, as Joest points out, because the small piece that was left after the worms pulled apart was too small to have lived independently for any length of time, and must have derived all its nourishment from the larger piece.