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110 birds, and careering after foxes. In the hunting stage, men had periods of violent exertion alternating with complete quiescence, while women had activities which were more continuous, but less strenuous and less exciting. This probably accounts for the fact that men are more prone to gambling than women. One result of adaptation to the hunting stage is that most people like loud noise at times of excitement, alternating with silence at other times. In modern industrial life the noise is continuous, and this certainly has a debilitating nervous effect. T believe that almost everyone has a need (though often not a desire) for the sights and smells of the country. The delight of slum children on a country holiday is of a kind that points to the satisfaction of an instinctive need which urban life cannot supply. In recovering from a dangerous illness, the pleasure of being still alive consists mainly in joy in sunshine and the smell of rain and other such sensations familiar to primitive man.

The difference between needs and desires is important in the consideration of instinctive happiness. Our desires are mainly for things which primitive man did not get without difficulty: food and drink (especially the latter) leadership of the tribe, improvements in the methods of hunting and fighting. But we have many needs which are not associated with desires, because under primitive conditions these needs were always satisfied. Such are the needs of country sensations, of occasional silence and occasional solitude, of alternations of excitement and quiescence. To some extent, sex and maternity in women come under this head, because in a primitive community men see to the satisfaction of these feminine needs without any necessity for female co-operation. Per contra, there are desires which do not correspond to instinctive needs. The most important of these are the desires for drugs, including alcohol and tobacco. The fact that these desires are so readily stimulated by habit is an example of natural maladjustment from a Darwinian point of view. They differ from instinctive needs in two ways. First, from the point of view of survival, their satisfaction is not biologically useful; drugs do not help a man either to survive, himself, or to have a numerous progeny. Secondly, from the psychological point of view, the craving that they satisfy depends upon the habit of taking them, not upon a pre-existent need. The instinctive dissatisfaction which leads a man to take to drink is usually something wholly unconnected