GEOLOGY — CHAMBERIvINj MOULTON. 22$ 



sulphate, calcium carbonate, and calcium bicarbonate of water-solutions in 

 contact with it, by Prof. Julius Stieglitz. 



Dr. Chamberlin was given leave of absence from January i to July i, 

 1909, to serve as commissioner on the oriental educational investigation of 

 the University of Chicago. This gave incidental opportunity for diastrophic, 

 physiographic, and other observations tributary to studies in hand on the 

 modes of earth-deformation. While these observations were necessarily cur- 

 sory, they were not without value in giving some personal familiarity with the 

 facies assumed by the great deformations of the Eurasian continent. Most 

 of the work lay in the Chinese Empire, but some reconnaissances were made 

 in Japan and Siberia, and in northern, central, and southeastern Europe. 



Aside from work on the themes previously announced, the studies of Dr. 

 Chamberlin, since his resumption of service under the Institution, have 

 chiefly related to diastrophism. 



Moulton, F. R., University of Chicago, Chicago, Illinois. Grant No. 572. 

 Inquiry into the fundamental problems of geology. (For previous re- 

 ports see Year Books Nos. 4 and 5.) $2,000. 

 The papers published during the year are listed in the Bibliography, page 



52. The work not yet published and that under preparation is : 



The Probability of Near Approach of Two or More Stars, and Related 

 Questions: 

 This paper was started two years ago and the first draft of it is finished. 

 Some of the results of interest are that the probability of actual collision of 

 suns is so small that this possibility may be neglected in questions of cosmo- 

 gony, but that suns may pass relatively near one another frequently enough to 

 make this factor an important one in celestial evolution. 



Some Dynamical Considerations on Globular Star Clusters: 



Read before the Astronomical and Astrophysical Society of America, 

 August 19, 1909. In this paper it was shown that taking reasonable assump- 

 tions as to the dimensions and masses of the globular clusters, relative 

 motions of their members will not be observable unless the measurements 

 cover several decades. 



On the Orbits of Particles Ejected from One Sun and Moving Subject to 

 the Disturbing Influence of a Visiting Sun: 

 For an earlier report on this subject see Year Book No. 4 (1905), pp. 

 186-190. The computations described there have been extended, but the 

 discussion of the results is not yet finished. 



• 



Periodic Orbits: 



This is a book on periodic orbits being prepared in collaboration with my 

 former students, Dr. Herbert Earle Buchanan, of the University of Wis- 



