THE law creating the Iowa Geological Survey provides for 

 the publication of Bulletins on subjects of economic inter- 

 est relating to the Natural History of the State. It is with 

 sincere pleasure that the Survey now presents to the people 

 of Iowa, Bulletin Number 1. This volume treats of the Grasses 

 of Iowa, a subject of p imary importance to the rapidly devel- 

 oping agricultural interests of the state. The preparation of 

 the volume involved an immense amount of careful and con- 

 scientious work, but it was all done as a labor of love on the 

 part of the authors. The work is submitted in the confident 

 belief that it will be of the highest value to the great industry 

 that so conspicuously transcends all other industries in our 

 magnificent state. 



Samuel Calvin, 



State Geologist. 



