'5 



Anhang. It might be thought that this posi- 

 tion arose from the fact that these diseases 

 were less common in Europe than here, but 

 since the experience of Harding, who found 

 the well known bacterial black rot of cabbage 

 distributed widely throughout all Europe and 

 even in the botanical gardens of some of the 

 universities, it seems that a failure to adopt the 

 results of work carefully performed in this, 

 country must rest upon some other reason than 

 lack of opportunity to study these maladies. 



Another field in which American investiga- 

 tion has been particularly fruitful has been in 

 the study of the problems associated with puri- 

 fication of water-supplies, and also in sewage 

 disposal. Problems of this character press 

 most earnestly for solution in older settled 

 countries, and it is therefore a matter of some 

 moment that American laboratories should 

 have played so important a part in the develop- 

 ment of this knowledge. The classical re- 

 searches which were begun by the State Board 

 of Health of Massachusetts in the latter part 

 of the eighties,, at which time the Lawrence Ex- 

 periment Station was founded, have always 

 occupied a foremost position in work of this 

 character. Many of the underlying principles 

 relating to the proper methods of sand filtra- 

 tion were first developed in this country. 



In technical methods, too, marked advances 

 have been made. Particularly is this true with 



