MENDEL’S PRINCIPLES OF HEREDITY — 325 
field station sinée Blackstone’s time (1737), until Mr. Jackson 
noticed it. As it occurs nowhere else in the Harefield district, 
this exact locality is very probably Blackstone’s “locus classicus,” 
and it is there very abundant and in patches of considerable 
size.—F. N. WILLIAMS. 
REVIEWS. 
Mendel’s Principles of Heredity. By W. Bateson, M.A., F.R.S. 
rown 8yo, pp. 396. Three portraits, six coloured plates, 
and thirty-three figures. Price 12s. net. Cambridge 
University Press. 1909. 
' «Tire object of this book is to give a succinct account of 
discoveries in regard to Heredity made by the application of 
Mendel’s method of research.” uch is the author’s definite 
almost at once sold out, and having served its purpose was not 
reprinted. The present work is the most complete treatise on the 
Mendelian aspect of Heredity which has yet appeared in English ; 
factors as they have been called. An important question then is, 
hat are the distinctive features of Mendelian inheritance which 
differentiate the cases exhibiting it from those to which Francis 
scientific problems seeks an answer to these questions. To him 
Galtonism is the statement of a theory based on the mathematical 
