VOLUME XIX, NO. 3 
MAY, 1920 
Denison University Bulletin 
Journal 
OF THE 
Scientific Laboratories, 

Volume XIX Articles 9-12 Pages 147 to 224 
9. Psychological Factors in Vocational Guidance. By Thomas A. Lewis 147 
10. The Use of Models in the Interpretation of Data for Determining 
the Structure of Bedded Rocks. By Maurice G. Mehl 157 
11. Some Suggestions for Indicating Drilling Operations. By Maurice 
G. Mehl 169 
12. The Kimmswick and Plattin Limestones of Northeastern Missouri. 
By Aug. F. Foerste 175 
The University Bulletin is issued bi-monthly, and is entered at the Granville, Ohio, 
Postoffice as mail matter of the second class. 
