E2L4
Lemma — Part II
Latin
Si corporis sive individui quod ex pluribus corporibus componitur, quædam corpora segregentur et simul totidem alia ejusdem naturæ eorum loco succedant, retinebit individuum suam naturam uti antea absque ulla ejus formæ mutatione.
English (Elwes 1883)
If from a body or individual, compounded of several bodies, certain bodies be separated, and if, at the same time, an equal number of other bodies of the same nature take their place, the individual will preserve its nature as before, without any change in its actuality (forma).
Modern English
If from a body or individual composed of several bodies certain bodies are removed, and at the same time an equal number of other bodies of the same nature take their place, the individual will retain its nature as before, without any change of form.