This experiment confirms and extends an earlier finding that a hungry rhesus monkey (O) will avoid securing food if this subjects another monkey (SA) to electric shock. In the present series this “sacrificial” behavior was manifested in 6 of 10 animals independently of the relative position of the two animals in a dominance hierarchy. It was also found that while prior shock of the O resulted in inhibition of responding following the introduction of shock to the SA, this variable was not correlated with the final manifestation of a sacrificial pattern.