1)

(a)The Melikah of a bird-offering may be performed - anywhere on the Mizbe'ach.

(b)We learn from the Pasuk in Vayikra "ve'ha'Nish'ar ba'Dam, Yimatzei el Y'sod ha'Mizbei'ach" - that the Haza'ah (sprinkling of the blood) of a Chatas ha'Of must be performed on the lower half of the Mizbe'ach, where the blood can trickle down to the Y'sod (which it cannot do if it is sprinkled on the top half, because should the Kohen sprinkle the blood above the Soveiv, the ledge that surrounds the Mizbe'ach), the Soveiv will prevent it from reaching the Y'sod.

(c)The Mitzuy (squeezing the blood on to the Mizbe'ach) of the Olas ha'Of is performed on the upper half of the Mizbei'ach.

(d)The sprinkling of the blood of Beheimos (both the Haza'ah of a Chatas and the Zerikah of an Olah) is performed in exactly the opposite way: the former, above the Chut ha'Sikra on the actual Keren, and the latter, below it.

(e)The Siman 'Ayin Ayin, Tes Tes' stands for Olas ha'Of le'Ma'alah, ve'Cha*tas* ha'Of le'Matah' (presumably, the first Ayin covers Olah, too, as if there were three 'Ayins').

2)

(a)In the event that the Kohen changes any of the above, that particular Korban is invalidated ...

(b)... except for the Mitzuy of the Chatas ha'Of, which does not invalidate the Korban if it was performed on the upper half of the Mizbei'ach - because, according to one opinion at least, even if it is not performed at all, the Korban is nevertheless Kasher.

3)

(a)The Kan Chovah of a Ger consists of two Olos - whereas all other Kinei Chovah consist of one Chatas and one Olah.

(b)A Kan Neder or a Kan Nadavah Nedavah, like the Kan Chovah of a Ger - consists of two Olos.

(c)The Tana defines a Neder as - someone who declares 'Harei Alai Olah' (which he must subsequently replace should it die or get stolen), and a Nedavah as - someone who declares 'Harei Zu Olah (which he does not need to replace).

(d)A Zav and a Zavah bring a Kan even if they are wealthy, as opposed to all other Kinei Chovah, who bring birds only if they are poor.

4)

(a)If ...

1. ... a Chatas becomes mixed up with with an Olah, or even with ten thousand Chata'os, or vice-versa, then they must all die, because live animals do not become Bateil (due to their Chashivus), in which case, the Kohen will not know where to sprinkle the blood (above or below the Chut ha'Sikra).

2. ... a Chatas became mixed up with two unspecified Kinei Chovah - then only the number of Chata'os in the Chovah (two in this case) are Kasher, because that is the number of birds that can be brought without creating a problem how to sprinkle their blood. (And similarly, if it is Olos that are mixed up, then it will be the number of Olos in the Chovah which will be Kasher).

(b)In the latter case, one cannot bring ...

1. ... a third Chatas to cover the Chatas that fell in - in case it is one of the remaining Olos of one of the two Kinin that fell in.

2. ... even one Olah - in case it is the Chatas.

(c)The Tana concludes that the same Din will apply there where an Olah (or Olos) falls into a Kan or Kinei Chovah, irrespective of whether the Chovah is the majority and the Nedavah, the minority, or vice-versa. The Tana refers to the specific Olos as Nedavah - because all Nedavos are Olos.

5)

(a)The Mishnah rules that in a case where two or more (unspecified) Kinei Chovah become mixed up with ...

1. ... an equal number of Kinei Chovos (e.g. if a Kan S'tumah fell into the Kan of another Yoledes or a Kan S'tumah Zavah into the Kan S'tumah of another Zavah - then half of the Kinin are Kasher (half Olos and half Chata'os) see Tif'eres Yisrael (25).

2. ... an unequal number of Chovos - then the lesser of the two are Kasher (half Olos and half Chata'os).

6)

(a)In the latter case, the Mishnah concludes 'Bein mi'Shem Echad, Bein mi'Sh'nei Sheimos, Bein me'Ishah Achas, Bein mi'Shetei Nashim (see Tif'eres Yisrael 25). The Tana explains ...

1. ... 'Shem Echad' to mean - that both sets of Kinim belong either to a Zavah or a Yoledes.

2. ... 'Sh'nei Sheimos' - that one belongs to a Zavah, and the other, to a Yoledes.

(b)Assuming that the one is Chayav one Kan and the other, two, one cannot bring two Olos - in case the third bird belongs to the woman who is only Chayav one set of birds, who is only Chayav one Olah (and not two).

7)

(a)Rebbi Yossi rules that, if two women give two Kinim to a Kohen jointly, or the money to buy two Kinim jointly, the Kohen is permitted to bring one Kan for each woman - and he decides which birds to bring as a Chatas and which to bring as an Olah.

(b)Nor will it make any difference - whether the respective Kinim are of one Shem or of two Sheimos.

(c)Despite the fact that Rebbi Yossi himself seems to hold 'Ein B'reirah' (as we learned in a Beraisa at the end of Me'ilah [see Tosfos Yom-Tov]) this is possible - where the women stipulated when designating their respective Kinim that the Kohen would decide which is which (see also Tif'eres Yisrael).