A bone the size of a barleycorn that was divided into two — R’ Akiva rules it tamei, but R’ Yochanan ben Nuri rules it tahor. R’ Yochanan ben Nuri said: They did not say, ‘‘Bones the size of a barleycorn.’’ Rather [they said], ‘‘A bone the size of a barley-corn.’’ A quarter [-kav] of bones that was crushed so that no bone is the size of a barleycorn — R’ Shimon rules [it] tahor, but the Sages rule [it] tamei. A limb [severed] from a living person, that was divided into two, is tahor. R’ Yosi declares it tamei, but he agrees that if [the limb] was removed [from the living person] half at a time, it is tahor.

Any of the items that convey tumah through ohel, that were divided and brought in-to a house, R’ Dosa ben Harkinas rules [him] tahor, while the Sages rule [him] tamei. How so? [If] someone touches two pieces of [animal] carcass, each [one] half the size of an olive, or carries them; or, [in the case of] a corpse, if someone touches [a piece of flesh] half the size of an olive and [simultaneously] forms a roof over [an-other] piece half the size of an olive; or he touches [a piece of flesh] half the size of an olive, and [another piece] half the size of an olive forms a roof over him; or he forms a roof over two pieces, each half the size of an olive; or the person forms a roof over [a piece of corpse] half the size of an olive, and a piece half the size of an olive forms a roof over him, R’ Dosa ben Harkinas rules [him] tahor, while the Sages rule [him] tamei. But [if] someone touches [a piece of corpse flesh] half the size of an olive and [simultaneously] something forms a roof over him and [a different piece of corpse flesh] half the size of an olive, or one forms a roof over a piece [of corpse flesh] half the size of an olive and [simultaneously] something forms a roof over him and [a dif-ferent piece of corpse flesh] half the size of an olive, he remains tahor. R’ Meir said: Even in this case R’ Dosa ben Harkinas rules [him] tahor and the Sages rule [him] tamei. Everyone becomes tamei [in the above situations] except [where tumah contracted through] touch coincides with [tumah contracted through] carrying, and [the cases in which tumah contracted through] carrying coincides with [tumah contracted through] ohel. This is the rule: Anything in the same category is tamei; whereas those in dif-ferent categories remain tahor.

[If] a ladleful of corpse powder was scattered inside a house, the house becomes tamei. R’ Shimon declares [it] tahor. [If] a quarter [-log] of blood was absorbed into a house, the house is tahor. [If blood] was absorbed into a garment — if a quarter [-log] of blood comes out when [the garment] is washed, [the garment] is tamei. If not, it remains tahor, because whatever is absorbed and cannot come out is tahor.

. [A quarter-log of corpse blood] was spilled in the air — if the place [where the blood spilled] was on an incline, and [a person] formed an ohel over part [of the blood], he remains tahor. [If the blood] was in a crack or if it congealed, [the person] becomes tamei. [If the blood] was spilled onto the threshold [of a house] that inclines either inward or outward, and the house forms a roof over it, [the house] remains tahor. [If the blood] was in a crack or [if] it congealed, [the house] becomes tamei. Every part of a corpse is tamei, except for the teeth, hair, and nails. But while they are connected [to the body], they are all tamei.