Slide showing 28 photographic images of a newt illustrating normal sequence of limb movement. Slide shows 28 black and white photographic images of a newt illustrating normal sequence of limb movement. Image 4 labelled '1'. Image 9 labelled '2'. Image 18 labelled '3'. Image 23 labelled '4'. Title under image reads 'Figure 12. Normal sequence of limb movement in the newt (Triton christatus). The numerals indicate the sequence of flexion. 1, right fore. 2, left hind. 3, left fore. 4, right hind. The photographs were taken at intervals of 1/12th sec.' Late 19th - early 20th century