Locher, Jacob, 1471-1528. Carmen heroicum de partu monstrifero. 
One of the earliest printed illustrations of a set of conjoined twins and the earliest printed work devoted entirely to the subject. The crude woodcut depicts thoracopagus twins, i.e. twins joined at the chest. The inset shows the bands of tissue and shared organs uniting the twins.

Locher, Jacob, 1471-1528. Carmen heroicum de partu monstrifero. 

One of the earliest printed illustrations of a set of conjoined twins and the earliest printed work devoted entirely to the subject. The crude woodcut depicts thoracopagus twins, i.e. twins joined at the chest. The inset shows the bands of tissue and shared organs uniting the twins.