Two new alkaloids, brunsvigine and brunsvinine, are isolated from Brunsvigia cooperi Baker bulbs collected in summer, lycorine replacing brunsvinine in bulbs collected in late autumn. Crinamine is also isolated throughout. Brunsvigine is shown to be isomeric with lycorine, possessing the same groups as the latter, but differing from lycorine in ease of dehydration and in the behaviour of the dihydro-derivative.