Jean Astruc, noting that parents of both sexes seemed to influence the characteristics of their offspring, suggested that the animalcule came from the sperm and was then shaped as it passed into the egg.
Jean Astruc, mencatat bahwa orang tua dari kedua jenis kelamin tampaknya mempengaruhi karakteristik anak-anak mereka, menyarankan bahwa animalcule berasal dari sperma dan kemudian dibentuk ketika melewati telur.