Book reviewed in this article:Petersen, B., Törnblom, O., undBodin, N.‐O., (Zoologisches Institut Uppsala), Verhaltensstudien am Rapsweißling und BergweißlingMoore, N. W., on the so‐called “territorie” of Dragonflies (Odonata, Anisoptera)Moore, N. W., notes on the oviposition behaviour of the dragon‐flySympetrum striolatumDeleurance, Ed. Ph., Étude du cycle biologique du couvain chezPolistes: les phases “couvain normal” et “couvain abortif”Altmann, Margaret, social behavior of Elk,Cervus canadensisNelsoni, in the Jackson Hole area of WyomingBierens de Haan, J.A., das Spiel eines jungen solitären SchimpansenFrings, H.undM., Fuller, J.L., Ginsburg, B.E., Ross, Sh., standardization of nomenclature describing audiogenic seizures in miceHayes, C., the ape in our house (Der Affe in unserem Haus)Thorpe, W. H., The learning abilities of birdsMasserman, J. H., Principles of dynamic PsychiatryDinsmoor, J.A.The retention of a discriminationWirth, D., Grundlagen einer klinischen Hämatologie der HaustiereHocking, B.,Hornia minutipennisRiley: A new Record and some notes on BehaviourGoldschmidt, Richard B., understanding heredity. An introduction to GeneticsMcBride, Arthur P., undKritzler, Henry, Observations on pregnancy, parturition, and postnatal behavior in the bottlenose dolphinKoenig, Otto, Weg ins Schil