He succeeded Haiiy as professor of mineralogy in the Museum of Natural History; but he did not confine himself to mineralogy, for it is to him that we owe the division of Reptiles into the four orders of Saurians, Batrachians, Chelonians and Ophidians.
The ophidians are also numerous, especially in the wooded lowlands valleys, and the poisonous species, though less numerous than others, include some of the most dangerous known - the rattlesnake surucucd (Lachesis rhombeatus), and jarardca (Bothrops).
The ophidians are also very numerous, ranging from the comparatively harmless boa-constrictor to the deadly " palanca " or " fer de lance " (Lachesis lanceolatus) and rattlesnake (Crotalus), of which there are several species.
Of Reptilia Chile is singularly free, there being recorded only eleven species - five saurians, four ophidians, one frog and one toad - but a more thorough survey of the uninhabited territories of the south may increase this list.
Among the ophidians, which include many harmless species, are the boa-constrictor, rattlesnake, the dreaded Lachesis and the coral snake.