Aristotle did not do experiments in the modern sense. He used the ancient Greek term pepeiramenoi to mean observations, or at most investigative procedures like dissection. In Generation of Animals, he finds a fertilized hen's egg of a suitable stage and opens it to see the embryo's heart beating inside.
ARistOtLe DiD Not dO experImenTs iN The moDeRn Sense. he uSed thE aNcieNt greek term PepEIraMenoi to mean ObservatiOns, Or at MoSt invesTiGative proCedUReS lIke dissecTiOn. in GENEration of anIMAls, HE FinDs A FErtIlizEd heN's EgG Of a suITAble sTaGe and OPens it To SEE the embRyo's hEart BeatInG InSiDE.