24 PROCEEDINGS OF THE CHICAGO MEETING 



quired shows that manj' chemical and physical researches have been made and 

 are at present being made that have, or might have, a bearing on problems in 

 sedimentation, but relatively few investigators are actually applying the re- 

 sults to geological processes or are making investigations of problems in sedi- 

 mentation. 



A list of titles of papers based on physical and chemical researches bearing 

 on sedimentation has been prepared for papers that have appeared during the 

 last year. The list shows several classes of investigations. Papers that de- 

 scribe sedimentary deposits in more or less detail are prominent. There are 

 some papers that deal with methods of analysis and measurement. The be- 

 havior of colloids alfords a voluminous literature, showing that this branch 

 of science is growing and that theories are being tested and qualifying facts 

 added to first generalization. There are also papers involving botany, soil, 

 chemistry, the acidity and alkalinity of waters, flocculation, alteration of rocks, 

 and dehydration. 



Eead from manuscript b}' E. W. Shaw. 



FIELD DESCRIPTION OF SEDIMENTS 

 BY MARCUS I. GOLDMAN 



{Abstract) 



This is the report of a subcommittee of the Committee on Sedimentation of 

 the National Research Council. The purpose of the work of this subcommittee, 

 which consists of D. F. Hewett, Kirk Bryan, and Marcus I. Goldman, chair- 

 man, is to prepare a schedule that can be pasted in the cover of a notebook 

 for use in the description of sediments and sedimentary rocks in the field. As 

 it is impossible to include in such a schedule all the characters that might be 

 recognized, the aim has been to list those which are more generally considered 

 important or which are related to current trends of interest in the study of 

 sedimentary rocks. The compilers have particularly emphasized the impor- 

 tance of stating the results in qimntitative terms. 



Presented from notes. 



PREPARATION OF A TREATISE ON SEDIMENTATION 

 BY W. H. TWENHOFEL 



• (Ahstract) 



The treatise in course of preparation is designed to cover the range of 

 processes and phenomena which have to do with the origin, transportation, 

 deposition, and solidification of sediments. It is believed that such a work, 

 besides furnishing a convenient summary of what is at present- known regard- 

 ing sedimentation and the criteria for interpreting sediments, may both stimu- 

 late and guide future researches. 



Eead from manuscript. 



