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Where inside tractate Nidda can I find R' Isaac Alfasi's commentary on the tractate? I looked in hebrewbooks.org's 685-page tractate-Niddah PDF but couldn't find it.

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Is there a particular reason you are only interested in viewing the commentary in this particular pdf file on Hebrewbooks.org, or can this question be broadened (eg "Where is the Rif on Niddah? I can't find it at the end of the Masechta where I expect it to be, but I'm using Hebrewbooks.org, so maybe it's an error in the file. Does anyone know if it's printed in a standard Sha"s?") – Seth J Feb 1 '13 at 14:17
@SethJ: Point taken. Question edited. Thank you. – tealhill Feb 1 '13 at 17:40
up vote 7 down vote accepted

R' Alfasi's laws of Niddah are actually hidden in the second chapter of tractate Shevuos. If you don't have a printed tractate handy, then see pages 767 through 778 of hebrewbooks.org's Sanhedrin-Makkos-Shevuos PDF.

As a courtesy to the reader ש”ס נהרדעא also includes a second copy of R' Alfasi's laws of Niddah inside tractate Niddah. This second copy is not typeset as nicely. You can find it on pages 283 through 294 of hebrewbooks.org's PDF.

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Are PDF pages 283 through 294 of ש”ס נהרדעא: מסכת נדה really the Rif's digest of the entire tractate? The tractate is not a short one. – tealhill Feb 1 '13 at 5:55
@tealhill It says in your link to page 283 that the text they print is originally from Shevuot but was copied there as a favor to the one learning. As for your second point, it is not a short tractate, but most of it discusses things which are not relevant nowadays regarding ritual impurity and the like. – Double AA Feb 1 '13 at 6:18

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