24 ANNUAL REPORT OF THE 



also connected with the Missouri Geological Survey. Mr. Tilton 

 has returned to his position as Professor of Natural Science in 

 Simpson College, Indianola, Iowa. 



A trip made by Mr. Griswold through the West during the past 

 summer has been fruitful in the way of geographical and geologi- 

 cal observation. Visits were made to the Arizona plateau, in the 

 neighborhood of the Grand Canyon of the Colorado and the San 

 Francisco Mountains ; to the Pacific slope, with sections across 

 the Sierra Nevada and the Cascade ranges to the interior basins ; 

 to the desert regions of Idaho, Utah, and Arizona ; and to the 

 Rocky Mountain plateau in Montana, Wyoming, and Colorado. 

 During this excursion an address was made to the Teachers' In- 

 stitute of Lewis and Clarke County, Montana, on Geology in a 

 Common School Education. 



REPORT ON COURSES IN THE SUMMER SCHOOL. 



The department has this year somewhat increased its offering of 

 courses which may be pursued during the summer vacation. The 

 aggregate attendance on these courses was thirty-two. The greater 

 part of the instruction was given by officers of the department, all 

 those in service taking some share in the work. It was, however, 

 as heretofore, found necessary to call on others for aid in the sec- 

 ond summer course in Geology. The department is indebted to 

 Prof. A. P. Brigham of Colgate University, and to Dr. H. B. Kiim- 

 mcl of the New Jersey Geological Survey, for instruction at Utica 

 and Catskill respectively. 



