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Scientific Laboratories 
DENISON UNIVERSITY 
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Articles 5-8 
Volume XIX 
5. Notes on Isotelus, Acrolichas, Calymene, and Encrinurus. By. 
Aug. F. Foerste 65 
6. Some Suggested Experiments for the Graphic Recording of 
Speech Vibrations. By Robert James Kellogg 83 
7. The Manipulation of the Telescopic Alidade in Geologic 
Mapping. By Kirtley F. Mather 97 
8. The Importance of Drainage Area in Estimating the Possibilities 
of Petroleum Production from an Anticlinal Structure. By 
Kirtley F. Mather and Maurice G. Mehl 143 
I' 
GRANVILLE, OHIO, SEPTEMBER. 1919 
Denison University Bulletins University Series Vol. XIX, No. 7 
The University Bulletins are issued bi-monthly, and are entered at the Postoffice 
at Granville as mail matter of the second class. 
