Bava Batra

What is [the law if they  are arranged] like a ring,  like a straight line,  in the shape of a stadium  or in that of a crooked road?  The matter is undecided. A Tanna taught: If a rock is isolated,  it is not measured  with the field, however small  [that rock might be]. And [even] if it was [in the field, but] near the boundary, it is not measured with the field, however small  [that rock might be]. R. Papa inquired: What [is the law if some] earth intervenes between [the rock and the boundary]? — The matter is undecided. R. Ashi inquired: What [is the law if] there was earth beneath  and rock above, [or] earth  above and rock beneath?  — The matter is undecided. MISHNAH. [IF A MAN SAYS TO ANOTHER.] 'I SELL YOU A BETH KOR OF ARABLE LAND, MEASURED WITH THE ROPE',  [AND] HE GAVE [HIM] LESS, [EVEN IF ONLY BY] A FRACTION, [AN EQUAL SUM] IS TO BE DEDUCTED [FROM THE PRICE]. [IF] HE GAVE MORE, [EVEN IF ONLY BY] A FRACTION, IT IS TO BE RETURNED [TO HIM]. IF, HOWEVER. HE SAID,  'MORE OR LESS,'  THE SALE IS VALID EVEN IF HE GAVE [AT THE RATE OF] A QUARTER OF A KAB PER SE'AH  LESS OR MORE. [IF THE DIFFERENCE IS] GREATER THAN THIS, CALCULATION IS TO BE MADE.  WHAT IS [THE BUYER] TO RETURN TO HIM? — THE MONEY.  IF, HOWEVER. [THE SELLER] PREFERS, [THE OTHER] RETURNS TO HIM THE LAND. WHEREFORE [THEN] DID THEY  ENACT THAT [THE BUYER] IS TO RETURN TO HIM MONEY? — TO SAFEGUARD THE INTERESTS OF THE SELLER.  IF, THEREFORE. THERE WAS A SURPLUS IN THE FIELD OF AN AREA OF NINE KAB;  AND IN A GARDEN, AN AREA OF HALF A KAB  AND, ACCORDING TO R. AKIBA, A QUARTER OF A KAB;  THE LAND [ITSELF] IS TO BE RETURNED. NOT ONLY THE QUARTER  IS TO BE RETURNED BUT ALL THE SURPLUS. GEMARA. The question was raised: What [if the seller] only [said, 'I sell you] a beth kor'?  — Come and hear! [IF A MAN SAYS TO ANOTHER.] 'I SELL YOU A BETH KOR OF ARABLE LAND, MEASURED BY THE ROPE',