Geology. 561 



In the Caucasus, Karagom and Bartui are retreating, while 

 Midagrawin of the Kasbek group is apparently advancing. In 

 the Pamir, a group of recently explored glaciers show evidences 

 of retreating, and the Himalaya glaciers show a general retreat 

 coupled with sudden spasmodic advance on the part of certain 

 smaller ice lobes. In North America, the Hallett glacier (Colo- 

 rado) and several of the glaciers on Mount Hood seem to be 

 advancing. Those of British Columbia are receding and the 

 Alaska glaciers appear to be retreating, those in the Muir and 

 Reid inlets being modified by the earthquake of 1909. h. e. g. 



8. Hand Book for Field Geologists; by C. W. Hayes, Chief 

 Geologist, Geological Survey. Second edition, thoroughly 

 revised First thousand. Pp. viii, 159 ; 18 figures. New York 

 1909 (J. Wiley & Sons). — This treatise is divided into two parts, 

 the first dealing with the equipment, instruments and methods of 

 observation and collection; the second part giving instructions 

 for special field investigations in petrology, structural geology, 

 economic geology, etc. The value of the book is vouched for by 

 its contents and by the name of the author. It should be in the 

 hands of all young students of geology, and will be found of 

 assistance to field workers of large experience. h. e. g. 



9. A critical summary of Troosfs unpublished manuscript 

 on the crinoids of Tennessee; by Elvira Wood. Bull. 64, U. S. 

 Nat. Mus., 1909, pages vii and 1-150, plates 1-15. — In 1849 

 Louis Agassiz presented before the American Association for the 

 Advancement of Science a short paper by Gerhard Troost, then 

 State Geologist of Tennessee, on the fossil crinoids of that state. 

 "Troost's list," numbering 85 species, was published in the 

 Proceedings of the above society, but very little otherwise has 

 been made known of his studies until now, when the National 

 Museum does justice as best it can to the distinguished pioneer 

 in American geology and paleontology. 



The manuscript written in 1849 and submitted the following 

 year to the Smithsonian Institution described 108 species. Miss 

 Wood here treats 100 forms divided among the cystoids (7), 

 blastoids (7), crinoids (84), starfishes (1) and echinoids (1). Even 

 at this late date 39 specific names proposed by Troost will stand, 

 the remainder having been described by others since 1849. Of 

 genera, Troost proposed 16, of which 4 stand. Miss Wood pro- 

 poses 4 new species or new names, and adds many excellent wash 

 drawings and retouched photographs of her own making. The 

 author has put a great deal of hard work on the Troost manu- 

 script to bring it up to date. We are grateful for this labor of 

 love, and congratulate her on the excellence of her studies, c. s. 



10. Dendroid Graptolites of the Niagaran dolomites at Hamil- 

 ton, Ontario; compiled by Ray S. Basslee, Bull. 65, U. S. Nat. 

 Mus., 1909, pp. 76, plates 5. — Hamilton, Ontario, has long been 

 famous for its abundance of dendroid graptolites and they may 

 be found in many museums, due chiefly to Colonel Charles Coote 

 Grant. There are now known from this locality the surprising 



