1. Rav Yosef explains his opinion of the nature of the argument between Beis Shamai and Beis Hillel.
2. Rav Yitzchak explains his opinion of the nature of the argument between Beis Shamai and Beis Hillel.
3. The Beraisa discusses the laws of an egg laid on Yom Tov.
4. Something that will eventually be permitted is not nullified even when one part becomes mixed with a thousand parts of a permitted item.
5. The Gemara discusses a dispute about items that are generally sold by the unit.
A BIT MORE
1. Rav Yosef says that Beis Hillel maintains that an egg laid on Shabbos is included in the decree that prohibits fruit that fell from a tree on Shabbos.
2. Rav Yitzchak says that Beis Hillel includes an egg laid on Shabbos in the decree that prohibits a liquid that flowed from a fruit on Shabbos. The Chachamim prohibited the use of the liquid in order to prevent a person from squeezing the fruit (and transgressing the Melachah d'Oraisa of Sechitah) on Shabbos.
3. It may not be carried for any reason, but one may put a vessel over it to prevent it from being broken.
4. For example, if an egg laid on Yom Tov becomes mixed with one thousand eggs laid before Yom Tov, none of them may be used on Yom Tov, since they will all become permitted after Yom Tov.
5. There is a rule that items that people sell by the unit do not become nullified in a mixture. Some say that this refers to items that all people sell only by the unit, and some say that this refers to items that many people sell only by the unit.