28 THE PRINCIPLES OF SCIENCE. 



present work attempt any review of their writings, but 

 merely refer to the publications in which they are to 

 be found. 



of the British Association,' 1870. 'Report of Sections/ p. 12. Also, 

 ' On Boole's Laws of Thought.' By the Rev. Robert Harley, F.R.S., 

 ibid. p. 14. 



