[Avodah] ID of chilazon vs. chagavim

[Dov Kay]

R. R. Wolpoe wrote <<Or to put it another way, if resarch can ID a chilazon w/o a precedent -why not Chagavim?>> See footnote 19 of this article by R. Shaul Yonatan Weingort, originally published in Techumin: http://www.tekhelet.com/pdf/bein.pdf. The author argues for a distinction between simanim d'oraisa and simanim d'rabbanan.  The former may be relied upon without a mesora (eg fins and scales in fish), while the latter may not (eg birds).  With respect to chagavim, the Gemara explicitly states that "u'sh'mo chagav", which the SA then codifies as the requirement for a mesora.  In other words, the requirement for a mesora is built into the simanim for chagavim. This is not the case with techeles. May I respectfully ask that R. Wolpoe pay just a little more attention to the accuracy of his typing, as the typos are sometimes so egregious as to make his excellent posts hard to understand. Kol tuvDov Kay
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