Most mice infected with a pathogenic strain of Cryptococcus neoformans and maintained at 35 to 36[degree]C, lived longer than all infected mice kept at 24 to 27[degree]C. Those kept in the warmer chamber had higher rectal temps. It is suggested that the relative resistance of rabbits may be due to higher body temp. and that elevated body temps. may be useful in assisting treatment of human torulosis.