BRAIN WORK AND MANUAL WORK. 205 



of science a revision of the current theories as well as 

 new wide generalisations are wanted. And if the re- 

 vision requires some of that inspiration of genius which 

 moved Galileo and Newton, and which depends in its 

 appearance upon general causes of human development, 

 it requires also an increase in the number of scientific 

 workers. When facts contradictory to current theories 

 become numerous, the theories must be revised (we 

 saw it in Darwin's case), and thousands of simple in- 

 telligent workers in science are required to accumulate 

 them. 



Immense regions of the earth still remain unexplored ; 

 the study of the geographical distribution of animals 

 and plants meets with stumbling-blocks at every step. 

 Travellers cross continents, and do not know even how 

 to determine the latitude nor how to manage a barometer. 

 Physiology, both of plants and animals, psycho-physi- 

 ology, and the psychological faculties of man and animals 

 are so many branches of knowledge requiring more data 

 of the simplest description. History remains a fable 

 convenue chiefly because it wants fresh ideas, but also 

 because it wants scientifically thinking workers to recon- 

 stitute the life of past centuries in the same way as 

 Thorold Rogers or Augustin Thierry have done it for 

 separate epochs. In short, there is not one single 

 science which does not suffer in its development from a 

 want of men and women endowed with a philosophical 

 conception of the universe, ready to apply their forces 

 of investigation in a given field, however limited, and 

 having leisure for devoting themselves to scientific pur- 

 suits. In a community such as we suppose, thousands of 

 workers would be ready to answer any appeal for ex- 

 ploration. Darwin spent almost thirty years in gather- 

 ing and analysing facts for the elaboration of the theory 

 of the origin of species. Had he lived in such a society 



with facts, and methods of experimenting well known to engineers, 

 florists, cattle-breeders, and so on, could be produced in numbers. 



