246 ANNUAL, REPORT SMITHSONIAN INSTITUTION, 1920. 



out that these results of his were published some years ago in an 

 Italian journal, but have been overlooked by those in this country. 

 One can only hope that in the future, in view of the friendship be- 

 tween the countries now cemented on the recent battlefields, that 

 such accidents will not occur again. 



The foregoing article has dealt only with the outline and with the 

 more recent work upon a subject of large and increasing importance. 

 The field is a fruitful one, and one can only trust that with fresh 

 spade work by other workers our knowledge in this direction may be 

 amplified and thus rendered of even greater benefit to mankind. 



