כ כדאמר עולא בעומדין על הגבולין הכא נמי בעומדין על הגבולין
20 of abandoned ownership.<span class="x" onmousemove="('comment',' Loose limbs may have been dropped in transit, which the mourners being unable to identify, leave abandoned. On the practice of collecting bones after temporary burial and transferring them to their permanent place of rest v. infra ');"><sup>32</sup></span> But does not a field where a grave has been run over by the plough require to be marked? Surely it is taught: 'If one came upon a marked field without knowing its character,<span class="x" onmousemove="('comment',' Whether a grave had been lost in it, and the field cannot then be traversed by 'fanning', or whether the grave had the plough run over it in which case it may be traversed by 'fanning'.');"><sup>33</sup></span> then if there are trees on it,it is thereby indicated that a grave in it had been run over by the plough;<span class="x" onmousemove="('comment',' For the sake of the trees, this shows that a field in which a grave had been run over by the plough is marked.');"><sup>34</sup></span> if there are no trees, it is thereby indicated that a grave has been lost in it.<span class="x" onmousemove="('comment',' As such a field is not to be planted, Ohal. XVIII, 3; Tosef. Ohal. XVII.');"><sup>35</sup></span> R'Judah says: [The presence of trees is no criterion] until there is some elder or disciple [to attest it], for not all are well versed on the subject [of proper markings]'! - Said R'Papa: What is taught in this [latter Baraitha] refers to a field in which a grave had been lost, and which had [consequently] been marked. If there are trees on it, it is thereby indicated that a grave had been run over by the plough [subsequently]; if there are no trees on it, it is indicated that a grave had been lost in it.<span class="x" onmousemove="('comment',' And had not been ploughed over.');"><sup>36</sup></span> But is there not a danger that the trees are situate within the fie and the grave was outside?<span class="x" onmousemove="('comment',' I.e., where the soil had not been ploughed, so that it is treated like a field wherein a grave had been lost.');"><sup>37</sup></span> - as 'Ulla said [elsewhere that we speak of a case where]<span class="x" onmousemove="('comment',' Ned. 42b.');"><sup>38</sup></span> the trees are situate on the boundaries [of the field] here likewise they were situate on the boundary line.<span class="x" onmousemove="('comment',' And since dead are not buried on the road, the grave must be among the trees and has been run over by the plough, when the field has been tilled for the good of the trees.');"><sup>39</sup></span>