Of the 781 images in Animal Locomotion, 16 relate to baseball. Their plate numbers are 273–288. The first is labeled “Base-ball; pitching.” Five are “Base-ball; batting.” One is “Base-ball; batting (low ball).” One is “Base-ball; catching.” Five are “Base-ball; catching and throwing.” One is “Base-ball; throwing.” One is: “Base-ball; running and picking up ball.” The final plate is “Base-ball; error.”
All the models are identified only by three different numbers: 25, 26, and 30. According to the prospectus, the “greater number of [human models] engaged in walking, running, jumping, and other athletic games are students or graduates of The University of Pennsylvania—young men aged from eighteen to twenty-four—each one of whom has a well-earned record in the particular feat selected for illustration.” With this in mind, the most likely “baseball models” are in fact ballplayers. The most noteworthy is Thomas Love Latta (1865–1961), a catcher and captain of the varsity nine. The other two are Robert Edward Glendinning (1867–1936) and Morris Hacker Jr. (1866–1947).