We '' Know " More Than Facts 3 



to the total historical process, the changes through which all 

 things pass, and especially, to the changes through which the 

 forms of plants and animals have passed in the course of time. 

 As a historical process evolution is considered by scientists as 

 a fact, in the same sense as we speak of the " growth of the 

 British Empire " as a fact, or the ** industrial revolution," or 

 the *' replacement of the horse by the motor car." It is recog- 

 nized, of course, that these ** facts " are of a different order 

 from the multitude of simple experiences and judgments that 

 make up our every-day contacts with the world — I feel hot, 

 it rained yesterday, the diamond is harder than glass, the clock 

 struck ten. 



We '' Knoiv " More Than Facts 



Every adult whom you have known for many years was 

 at one time a child. Some of the other adults of your ac- 

 quaintance have intimated in one way or another that they 

 too were once children. Although you have not known 

 all of your acquaintances during their childhood years, 

 to say nothing of all the other adults in the world, it is not 

 difficult for you to feel sure that every adult was once a 

 child. Indeed, it would be difficult for you to believe the 

 opposite. 



From our common experience with human beings we 

 get certain facts and certain theories that we constantly take 

 for granted in all of our thinking. We have the facts about 

 the origin of certain particular individuals from parents, and 

 about the development of certain individuals from babyhood 

 to adulthood. We expand or extend these familiar facts to 

 all human beings now living (whom we could not possibly 

 have known ourselves) . We extend them to all human be- 

 ings who have lived in the past (with perhaps a few excep- 

 tions) . 



Then we have similar facts about other living things, 

 plants as well as animals. We make a parallel extension from 

 our experience and observations to other plants and animals 



