AS TO OURSELVES 



by continuous descent from primitive 

 metazoa but then what are We who are 

 making this review? 



Unhappily we are not like scientific be- 

 ings from another world, visiting this 

 planet to study its vital phenomena, but 

 we are ourselves part and parcel of that 

 which we are investigating. To say the 

 least, this fact is curious, and naturally 

 suggests the question whether after all 

 we are really of this earth or only by some 

 chance on it. Certainly this earth has no 

 other self -examining species. 



But before attempting any great ascent, 

 much preliminary work is necessary, and 

 so here, following as we should along the 

 lines of the physical conditions entering 

 into the life of man, we begin with his 

 bodily senses. It is by them that he comes 

 into relation with his physical world, be- 

 cause they afford the only means by which 

 at first he can do so. He is an inner 

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