(Beraisa - R. Shimon ben Yochai): Why did they say that ka'Adashah (the size of a lentil) of a Sheretz is Tamei? It is because its initial creation is ka'Adashah.

Questions (R. Yudan): [If so, also] less than k'Zayis of a Mes should be Tamei, [for its initial creation can be less than a k'Zayis], for R. Yochanan said 'this includes a Nefel that does not have a k'Zayis!'

And the size of a pea of a Neveilah should be Tamei, for R. Chaninah said 'I saw a calf the size of a pea in a fetal sac'!

Question: How [can R. Shimon answer this]?

Answer: These are Drashos; [when we can find a reason for the Shi'ur], we expound and receive reward. (We do not learn from it to other places - MAHARHAM DI LUZANZO, KIKAR LA'ADEN. MEICHAL HA'MAYIM and ALEI TAMAR - a Sheretz' initial creation is always ka'Adashah. Regarding Tum'as Mes or Neveilah, the initial creation is normally a k'Zayis, just in special cases, it is less.)

(Beraisa): What is Netzel? It is flesh of a Mes that melted, or liquid came out, and they congealed.

Question: This implies that while it is melted, no (it is not Metamei). Didn't R. Chaninah say in the name of R. Chelbo, if one melted a Mes, it is Tamei. If he cut it and melted it, it is Tahor?!

Answer #1: R. Yudan and R. Yosi [answered this]. One said, this excludes liquid that came out (it is not Metamei until it congeals, but melted flesh is Tamei even while it is a liquid).

Answer #2: The other said, (the Beraisa mentioned congealed) for if it congeals and there is a k'Zayis, it is Tamei (even when it was a liquid).

(Mishnah - R. Yosi): Flesh of a Mes that dried, and one cannot soak it to return to how it was, it is Tahor.

Question: What is R. Yosi's reason?

Answer: Does he not learn from Neveilah? Just like Neveilah, if it dried [and cannot become moist again] it is Tahor, also a Mes, if it dried, it should be Tahor.

Question (R. Ami): If [he learns from] Neveilah, [he should say that] just like Neveilah, if it spoiled, it is Tahor, also a Mes, if it spoiled, it is Tahor. If so, there is no [Tum'as] Netzel according to R. Yosi!

A Beraisa was found in the name of R. Yosi, that there is [Tum'as] Netzel according to R. Yosi!

Question (Talmidim, to the Amora R. Yosi): If [he learns from] Neveilah, [he should say that] just like Neveilah has no [Tum'as] Rekev, also a Mes has no Rekev!

Answer (R. Yosi): [The Tana R. Yosi] does not learn about bones from Neveilah, only about flesh. There is no Rekev from flesh, but there is Rekev from bones.

This is like Bar Kapara taught - "v'Rekev Atzamos Kin'ah."

(R. Yanai): "Oh b'Kever" [is extra, to teach] even if he touched the grave of Adam ha'Rishon (even though Hash-m formed him from the place of the Mizbe'ach, like it says right after this - MEICHAL HA'MAYIM).

(Talmidim): Rearrange the [word in] the verse "Oh b'Kever" [to read] '"Oh b'Rekev."

Support (Bar Kapara - Beraisa): "Oh b'Kever" - '"Oh b'Rekev."