Audio by Dr. Sruli Zyskind

If one sees an ownerless object and falls upon it, and another person comes and seizes it, he who has seized it is entitled to its possession. 
If a man sees people running after a lost article [e.g.,] after an injured stag [or] after unfledged pigeons, and says: `my field acquires possession for me`, it does acquire possession for him. But if the stag runs normally, or the pigeons fly [naturally], and he says: `my field acquires possession for me,` there is nothing in what he says
 מציעא 1.4
ראה את המציאה, ונפל לו עליה, ובא אחר, והחזיק בה-- זה שהחזיק בה, זכה בה׃ ראה אותם רצים אחר המציאה, אחר צבי שבור, ואחר גוזלות שלא פרחו, ואמר זכת לי שדי-- זכת לו; היה צבי רץ כדרכו, או שהיו הגוזלות מפרחין, ואמר זכת לי שדי-- לא אמר כלום
An object found by a man`s son or daughter who are minors, or by his Canaanite bondman or bondwoman, or by his wife, belongs to himself. An object found by his son or daughter who are majors, or by his Hebrew manservant or maidservant, or by his wife whom he has divorced, although he has not paid [Her the amount due to her according to] Her marriage-contract, belongs to the finder. מציעא 1.5
מציאת בנו ובתו הקטנים, עבדו ושפחתו הכנעניים, ומציאת אשתו-- הרי אלו שלו; מציאת בנו ובתו הגדולים, ועבדו ושפחתו העברים, ומציאת אשתו שגירשה, אף על פי שלא נתן לה כתובה-- הרי אלו שלהן

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