The elements of On the Savannah are derived from laboratory vessels whose forms have been drawn out and fused into each other, undergoing metamorphosis into flowing, organic forms. The tall, upright form suggests a connecting pipe or a Bunsen burner. In the lower elements can be seen the shapes of flasks, a laboratory jar and a mortar. The title refers to the prehistoric grassy plains on which animal life gradually evolved. Cragg may be drawing an analogy between biological processes of creation and metamorphosis, and those in the laboratory.