5 
In the following figures (Figs. 8—11) are shown those cases in which 
regeneration took place from outside of the breaking-joint. The third 
leg was cut off near the end of the fifth segment (counting the most 
distal segment as the first). As shown in Fig. 8 the missing part 
of the leg is regenerating from the cut-end (Sept. 13—26). Four new 
segments make up the new limb, corresponding to those that were lost. 
In another experiment (Sept. 11—26) the leg had been cut off 
obliquely leaving a small part of the fourth segment at one side of 
the oblique cut, Fig. 9. From the cut end a bud-like process. in- 
dicates the beginning of a new part. In Fig. 10 the cut was made 
between the fourth and fifth segments, or a little of the distal end of 
the fifth segment had been cut off. The new part as shown in the 
figure is made up of the missing four segments. In a third case in 
this experiment the new part is developing from the middle of the fifth 
segment (Fig. 11). 
Fig. 13. Fig. 15. 
Flg. 8. Fig. 9. Fig. 10. Fig, 11. 
Fig, 12, Fig. 14. 
While the number of cases of regeneration from outside the 
breaking-joint is regrettably small, nevertheless the results show very 
clearly that the leg has the power of regeneration in this region. It 
must be remembered too, that the number of cases is small not be- 
cause regeneration did not take place, but because in only a few cases 
was the leg retained. 
It has been pointed out that when the distal segment is cut off 
the leg is not thrown off, and sometimes the second segment may be 
cut off without the leg being lost. In none of these cases does a new 
bud appear at the cut-end as in the preceding experiment; but, if the 
crab be kept until it molts, the lost segment suddenly reappears. This 
mew segment is generally only a little smaller than the one cut off, 
