February 10, 1905.] 



SCIENCE. 



217 



is the series of coral reefs wlaich alternate 

 or which are associated with the saudspits 

 in certain localities. These reefs seem to 

 be comparatively thin, but many of them 

 are wide. That the coast has remained 

 stationary for a considerable time is indi- 

 cated by the fact that these reefs reach to 

 the upper limit of coral growth, where they 

 show broad areas of dead coral within the 

 fringe of living animals. 



In the restricted space of a summary 

 report like the present it will not be pos- 

 sible to do more than briefly outline the 

 contents of the more important of the 43 

 papers which were actually read, leaving 

 out of account those which were read only 

 by title. 



Dr. Robert Bell, director of the Geolog- 

 ical Survey of Canada, read a somewhat 

 detailed paper on the geology of the region 

 in the vicinity of the Great Slave Lake, 

 and illustrated his remarks by maps and 

 sections made for the Canadian Survey. 



Professor E. R. Cumings, of the Indiana 

 State University, discussed the develop- 

 ment and morphology of Fenestella, and 

 showed that this Devonian bryozoa is re- 

 lated genetically to the cyclostomata. In 

 a paper concerning new evidences of the 

 geographical differences of fossil faunas of 

 the same age. Professor H. S. Williams, of 

 Cornell University, stated that extended 

 study of the Devonian rocks of the eastern 

 United States pointed to the conclusion that 

 geological faunas once thoroughly estab- 

 lished probably possessed a geological range 

 far greater than is indicated by the actual 

 range in any particular section. 



The petrographie and economic papers 

 were introduced by Professor James F. 

 Kemp, of Columbia University, in a paper 

 detailing obsei'vations made along the gar- 

 net contact zones and associated copper 

 ores at San Jose, Taraaulipas, Mexico. 

 These contact zones are the result of the 

 action of an intruded bed of andesite upon 



the surrounding Cretaceous limestone. 

 Geologically the fcrmation of garnets has 

 been the most important feature and has 

 resulted from the rearrangement and rv- 

 crystallization of the materials present in 

 the limestone. The chalcopyrite, which is 

 the important ore, is a later phase of the 

 contact phenomena. In another communi- 

 cation Professor Kemp described his meth- 

 od of 'Geological Bookkeeping, ' which is 

 a system of taking notes in the field and of 

 locating the observations UDon the field 

 map, l)ased upon a series of definite and 

 invariably subdividing squares. This leads 

 to a compilation book in which the observa- 

 tions of scattered seasons are entered upon 

 pages which correspond in their enumera- 

 tion to the series of squares on the field 

 map. It is believed that the system pos- 

 sesses advantages in affording permanency 

 and intelligibility of records even though 

 the latter be made at widely diverse times 

 and by different individuals. 



In a paper on the occurrence and dis- 

 tribution of celestite-bearing rocks. Pro- 

 fessor E. H. Kraus, of Michigan State Uni- 

 versity, stated that the mineral occurs 

 widely throughout central New York and 

 southern California. The percolating 

 waters have leached out the crystals to a 

 considerable extent, forming the so-called 

 'vermicular' limestones of New York and 

 the 'gashed' and 'acicular' dolomites of 

 Michigan. Precipitation of the material 

 from these waters is the source of the large 

 deposits of celestite which occur at Put-In 

 Bay, the Maybee Quarry, Monroe County, 

 Mich., and elsewhere. 



Professor T. C. Hopkins, of Syracuse 

 University, described the closely crystal- 

 line, fine, fossiliferous, metamorphic lime- 

 stones of central and southern California 

 which contain the wonderful deposits of 

 tourmaline and other gems which have been 

 obtained within the past few years from 



