The Da Vinci Notebooks at sacred-texts.com
The relative proportions of the torso and of the whole figure.The cubit is one fourth of the height of a man and is equal to the greatest width of the shoulders. From the joint of one shoulder to the other is two faces and is equal to the distance from the top of the breast to the navel. 155 From this point to the genitals is a face's length.
179:155 9: dalla detta somita. It would seem more accurate to read here dal detto ombilico.
179:156 : Compare with this the sketches on the other page of the same leaf. Pl. VIII, No. 2.