334 NOTICE OF BOOK. 



mental research into their influence on soil-fertility. Here the 

 author, as an addendum, gives a list of books dealing with the 

 subject. This example might be very usefully followed by the 

 other authors when the opportunity arises for another edition. 

 We congratulate the authors on the appearance of this edition, 

 and the improvements which they have been able to introduce. 



