Production Note 

 Cornell University Library produced 

 this volume to replace the irreparably 

 deteriorated original. It was scanned 

 using Xerox software and equipment at 

 600 dots per inch resolution and 

 compressed prior to storage using 

 CCITT Group 4 compression. The digital 

 data were used to create Cornell ' s 

 replacement volume on paper that meets 

 the ANSI Standard Z39. 48-1992. The 

 production of this volume was 

 supported in part by the National 

 Endowment for the Humanities . Digital 

 file copyright by Cornell University 

 Library 1995. 



Scanned as part of the A.R. Mann 

 Library project to preserve and 

 enhance access to the Core Historical 

 Literature of the Agricultural 

 Sciences. Titles included in this 

 collection are listed in the volumes 

 published by the Cornell University 

 Press in the series THE LITERATURE OF 

 THE AGRICULTURAL SCIENCES, 1991-1995, 

 Wallace C. Olsen, series editor. 



