xii THE GRAMMAR OF SCIENCE 



Macaulay of King's College, Cambridge, has given aid 



in many ways, ever trying to keep the author's scientific 



radicalism within moderate and reasonable bounds. To 



his friend, Mr. R. J. Parker of Lincoln's Inn, the author 



is indebted for a continuation of that careful and 



suggestive revision which he has for the last ten years 



given to nearly everything the author has written. 



Especially, however, his thanks are due to Dr. R. J. Ryle 



of Barnet, whose logical mind and wide historical reading 



have produced a " betterment," which gives him almost 



a tenant-right in these pages. Lastly, the author has to 



thank his friend and former pupil, Miss Alice Lee, 



Assistant-Lecturer in Physics at Bedford College, London, 



for the preparation of the index and for several important 



corrections. 



KARL PEARSON. 



Gresham College, London, 

 January 1892. 



