Summary

Talmud (Rodkinson Edition) — Book 1…

Assisting is not of consequence (because if he alone is not able to perform the work himself, his assistance is of no value) . Said R. Zbid in the name of Rabha: "We have also learned in a Boraitha in support of this argument: If one suffering from a venereal disease rides an animal, the feet of which are encased in four pieces of cloth, the pieces of cloth are not subject to defilement, for the reason that the animal is able to stand on three feet." Why are they not subject to defilement?
Source: Wikisource

Talmud (Rodkinson Edition) — Book 1…

The difference of opinion is only concerning a man's paring his own finger-nails, but if he pared another's all agree that he is not culpable. (The reason for this is because when paring one's own finger-nails a man can make them look as if trimmed with an instrument, but when trimming another's this is not possible.)
Source: Wikisource

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