Voluntary Muscular work recorded and Measured

The student is fatiguing the muscles of his left hand ... (source: Physiology at Michigan, 1850-1923 by Horace W. Davenport)

La ola verde : revista satirica en un acto, cuatro cuadros, tres cuadritos y una apoteosis muscular /

Imprint on cover: "Sociedad de Autores Españoles."

Muscular contraction and the reflex control of movement,

"A chronological list of important contributions to the physiology of muscle": p. 53-55.