1. 1898. Oberservations on the Weight and Length of the Central Nervous Systems and of the Legs in Bull-Frogs of Different Sizes.?By Henry H. Donaldson, Journ. of Comp. Neurology, Vol. VIII, No. 4, Dec. See page 318.
2. 1900. Observations on the Weight and Length of the Central Nervous System and of the Legs in Frogs of Different Sizes (Rana virescens brachycephala Cope).?By Henry H. Donaldson and Daniel. M. Schoemaker, journ. of Comp. Neurology, Vol. X, No. I, February. See page 116.