vi. Foreword 



over a long period. Professor Biedl has rendered this task very 

 much more simple than it could have been in the absence of some 

 co-ordinating and focussing text-books such as he has now given 

 to labourers in this field. 



The English translation has been done in a manner deserving 

 of the highest praise. I have had many opportunities of com- 

 paring it with the original German text, and have in every case 

 had cause to admire the faithful, accurate, and even graceful 

 rendering of the meaning of obscure and highly technical 



passages. 



LEONARD WILLIAMS. 



