CONTENTS. 
Page. 
Letter of transmittal 5 
Introduction 7 
Objects, development, and results of the work of collecting well records and 
samples, by Myron L. Fuller 1 2 
Importance of accurate well records 12 
Value of well records to the driller for oil and gas 14 
Depth of productive rock 14 
Character of material 15 
Water supplies 15 
Casing off water 16 
Casing off ' ' cave ' ' rock 16 
Limits of depth 16 
Oil and gas shows 17 
Structure 17 
Value of records to owners of oil and gas wells 18 
Value of records to drillers or >wners of water wells 18 
Importance of records to geologists 20 
Work of collecting well records and samples 20 
Organization 20 
Early collection of records 20 
Proposed section of oil and gas, 1902 21 
Organization of the well division 23 
Work of the division of hydrology in 1903 24 
Present organization of the work 25 
Results -26 
Methods of work 27 
General plan and details of work, formulated by A. C. Veatch .. 28 
Sources of addresses of drillers and well owners 28 
Preparation of mailing list 29 
Arrangements for cooperation 30 
Taking of notes and samples 32 
Form of notebook used 32 
Taking and forwarding samples 35 
Examination and filing of samples 36 
Transfer to bottles 36 
Acknowledgment of samples 36 
Examination of samples and filing of records 36 
Storage of samples 36 
Importance of preservation of samples 36 
Labeling of sample bottles 37 
3 
