For a long time we have felt the need of a collective index 

 for the first ten volumes of the Philippine Journal of Science. 

 The annual indices have been of great service, but have not 

 all been uniform and are not sufficiently complete to indicate 

 all of the material in the respective yolumes. Therefore this 

 index has been compiled in uniform style and minuteness from 

 the original articles. The form is quite different from that 

 of the yearly indices, the variations having been planned in the 

 interest of completeness and convenience. In this way we have 

 endeavored to eliminate errors and have detected omissions. 

 The compilation of this ten-year index was begun in 1915, and 

 it was our intention to issue it very soon after the completion 

 of the tenth volume. The work of the preparation of this 

 index has been very large, and less clerical help has been also 

 available than was at first anticipated. Fot that reason the 

 index has not been issued as promptly as was planned. 



Alvin J. Cox, 

 Editor, Philippine Journal of Science. 



MAJ^ILA, P. I., September 1, 1917. 



