Rif Eruvin 8a {Eruvin 31a ... 34b}

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8a

{Eruvin 31a}
Mishna:
We may make an eruv with demai¹, and with maaser rishon from which teruma² had been taken off, and from maaser sheni and hekdesh which had been redeemed; and the Kohanim with challah and teruma
but not with tevel³, nor with maaser rishon from which teruma had not been taken off, nor with maaser rishon or hekdesh that had not been redeemed.

{Eruvin 31b}
If ones sends his eruv {techumin - at a distance up to 2000 cubits from him, to establish his 2000 cubit Shabbat boundary} in the hands of a deaf-mute, an imbecile, or a minor, or in the hands of one who does admit the lawfulness of an eruv, it is not an eruv. And if he tells someone to accept it from that person {at the destination}, it is an eruv.

Gemara:
"If ones sends his eruv in the hands of a deaf-mute, an imbecile, or a minor":
We establish this as referring to an eruv techumin, but in the case of an eruv chatzerot {of courtyards}, one who sends it in the hands of a deaf-mute, an imbecile, or a minor, it is an eruv, for we establish like Rav Huna that a minor may collect an eruv.

"And if he tells someone to accept it from that person, it is an eruv":
But let us be concerned that he does not reach him!
We are speaking of case in which he stands and watches him.
But let us be concerned that the other fellow does not take it from him!
There is an assumption {chazaka} that an agent does his assigned task.

{Eruvin 32b}
Mishna:
If he placed it {=the eruv} in a tree, higher than ten handbreadths, it is not an eruv; lower than ten handbreadths, it is an eruv.
If he placed it in a pit, even at a depth of 100 cubits, it is a valid eruv.

{Eruvin 34b}
If he placed it at the top of a reed or at the top of a pole, if it was detached and then inserted {into the ground}, even if 100 cubits high.

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Footnotes:
1: =produce where we are unsure that maaser has been taken off
2: = terumat maaser
3: = food from which teruma and maaser had not been taken