PREFACE 



The magazines have been indexed completely, in most cases, for the 

 three years. In the case of those added since 1916, the indexing has been 

 carried back to cover the period. In some instances the indexing has been 

 carried back to the beginning of the magazine, as in the case of the Journal 

 of Agricultural Research and the American Journal of Botany. The United 

 States Department of Agriculture Department bulletins are also indexed from 

 the beginning of the series. 



The Jou4-nal of Dairy Science, Soil Science, the Journal of Bacteriology, 

 System on the Farm, the United States Food Surveys, and the United States 

 Seed Reporters have all been started since 1916. The index to these journals 

 is, therefore, complete. 



A third questionnaire asking for a vote on a selected list of magazines 

 to be added to the list will be sent out early in the year. Periodicals will be 

 added to meet the need as it is expressed in the replies to this questionnaire. 



It is with pleasure that acknowledgement is made of the valuable assist- 

 ance of the Massachusetts agricultural college library, Mr. Charles R. Green, 

 librarian, in the work of indexing a few magazines not obtainable by the 

 Index. This service has made it possible to complete the indexing of several 

 volumes which would otherwise have been difficult of accomplishment. 



The work of the members of the staff has been particularly efficient and 

 painstaking. Grateful acknowledgement is made to Inez Cavert, Florence 

 Arnold, Angelina Vasti, and Agnes Flanagan for their aid in the endeavor to 

 make this volume an accurate record. Many helpful suggestions have been 

 received from subscribers and friends of the Index. Criticisms have been 

 made in a kindly spirit of cooperation. The new year is welcomed as a year 

 of extraordinary opportunity in all countries for all workers interested in 

 agriculture. N. T. S. 



January 20, 1919. 



