1. Editorial—The century’s ebb

   • W. Horsley Gantt

   EditorialNotes Pages: 133 - 134

2. “Reinforcement” in behavior theory

   • William N. Schoenfeld

   OriginalPaper Pages: 135 - 144

3. Acquisition and discrimination of appetitively and aversively conditioned heart rate responses in rhesus monkeys

   • George E. Billman
   • David M. Hasson
   • David C. Randall

   OriginalPaper Pages: 145 - 150

4. Exposition of visual stimuli in an aversive situation and self-exposure to light in rats

   • Jan Matysiak

   OriginalPaper Pages: 151 - 153

5. Are there two classes of classically-conditioned responses?

   • Leonard Green

   OriginalPaper Pages: 154 - 162

6. Learning capacities during sleep: A preliminary study in a group of schizophrenic inpatients

   • Carlo L. Cazzullo
   • Gaetano Penati
   • Leonardo F. Resele

   OriginalPaper Pages: 163 - 168

7. Familial vulnerability for experimental neurosis

   • William G. Reese

   OriginalPaper Pages: 169 - 173

8. The American physiologist— Philip Bard

   • Chandler M. Brooks

   OriginalPaper Pages: 174 - 176

9. Inhibitory ease—A personality type?

   • G. L. Mangan

   OriginalPaper Pages: 177 - 181

10. The relationship between motor and secretory behaviors in classical appetitive conditioning

    • E. A. Wasserman

    OriginalPaper Pages: 182 - 186

11. The localization over time of exogenous aldosterone and angiotensin II in various organs

    • Nelson H. Hendler
    • Andrew Livingston

    OriginalPaper Pages: 187 - 193