FRESHWATER INVESTIGATIONS DURING THE LAST 

 FIVE YEARS. 



HENRY B. WARD. 



It is just five years since the first report was published from 

 the Plon Biological Station, the first general public enterprise 

 of that character founded on fresh water and devoted to the solu- 

 tion of its problems. It is also just five years this summer since 

 the Michigan Fish Commission inaugurated work on the Great 

 Lakes by opening a laboratory on Lake St. Clair. The Plon 

 station has given a great impetus to freshwater work in Ger- 

 many, and to the efforts of the Michigan Fish Commission and 

 its corps of scientists can be traced much of the energy now 

 devoted to lacustrine investigation in this country. The half 

 decade which has intervened since 1893 has seen great progress 

 in this field and in view of the general interest taken in fresh 

 water work at the present time it may not be adjudged untimely 

 to give a resume of the results achieved during this brief pe- 

 riod. It seems fitting also to publish in this connection a bib- 

 liography which has been the result of much work on my part 

 and which I hope may be of some service to other workers in 

 this field, especially as no extended bibliography on this sub- 

 ject has yet been published and no summary of progress in 

 this line is available in English at least. 



While no effort has been spared to make the list of papers 

 complete, it is too much to hope that no reference has been 

 omitted which should have a place in its columns. On the 

 main lines of investigation, however, I hope that no important 

 article has been overlooked, but I should esteem it a favor to 

 have errors or omissions called to my attention by those who 

 note them. So far as possible all references have been verified 

 from the original and have been abstracted for the summary of 



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