11 



Professor Wadsworth spent a portion of the year in Cambridge, 

 arranging the lithological collections. He is now in Minnesota, 

 engaged in preparing a report on the lithology 'of that State for 

 the survey under the direction of Prof. N. H. Winchell. The pub- 

 lication of the u Lithological Studies " has not yet been resumed, 

 the work remaining in the condition indicated in the last Report. 

 The work in Minnesota will be of value in the continuance of the 

 " Lithological Studies," especially as a class of rocks is largely 

 represented in the region where Professor Wadsworth now is, with 

 which our collections are very imperfectly supplied. 



