February 27, 1903.] 



SCIENCE. 



341 



Lee, W. T., Professor of Geology in College, 

 Trinidad, Colorado. 



Littcll, Frank B., Professor of Mathematics, 

 U. S. Naval Obserratory. 



Lyman, Benjamin Smith, Geologist and Mining 

 Engineer. 



]^IcKenney, R. E. B., A.M., M.S., Ph.D., Expert 

 in Veg. Phys. and Path., Department of Agricul- 

 ture; Assistant Professor of Botany, Columbian 

 University. 



McLennan, John C, Associate Professor of 

 Physics, University of Toronto, Toronto, Canada. 



Martin, G. C, Assistant Geologist, Maryland 

 Geological Survey. 



Mead, Ehvood, Chief of Irrigation Investiga- 

 tions. 



Mendenhall, W. C, U. S. Geologist, Washington, 

 D. C. 



Miyake, Kuchi, Investigator. 



Moenkhaus, W. J., Teacher and Investigator of 

 Zoology, Bloomington, Indiana. 



Moore, Eliakim H., Head Professor of Mathe- 

 matics, University of Chicago. 



!Moore, P. M., Geologist and Mining Engineer, 

 St. Louis, Mo. 



Nelson, Aven, Professor of Biology, University 

 of Wyoming. 



Newsom, J. F., Stanford University. 



Olive, Edgar W., Instructor in Botany, Harvard 

 University. 



Ortmann, A. E., Curator Invert. Pal. Museum, 

 Princeton University. 



Park, William H., M.D., Bacteriologist, New 

 York Department of Health. 



Parker, Edward W., Statistician, U. S. Geolog- 

 ical Survey. 



Perrine, C. D., Astronomer, Lick Observatory. 



Pond, C. G., Professor of Chemistry, State Col- 

 lege, Pa. 



Putnam, Mrs. M. L. D., President of Daven- 

 port (la.) Academy. 



Quaintance, A. L., State Entomologist, College 

 Park, Wd. 



Kansome, Frederick Leslie, U. S. Gfeologist, 

 Washington, D. C. 



Rhodes, Edward, Instructor in Physics, Haver- 

 ford, Penn. 



Richardson, Miss Harriet, Connected with Smith- 

 sonian Institution. 



Richardson, Mark Wyman, M.D., Engaged 

 chiefly in laboratory work in clinical medicine, 

 Bo.ston, Mass. 



Sachs, B., il.D., C'liiiical Neurologist, New York. 



Schuchert, Charles, Paleontologist, U. S. Na- 

 tional Museum, Washington, D. C. 



Smallwood, W. M., Ph.D., Associate Professor 

 of Zoology, Syracuse, N. Y. 



Strong, Oliver S., Biologist and Neurologist, 

 Columbia University, New York. 



Thayer, William S., Associate Professor of Medi- 

 cine, Johns Hopkins University. 



Tyrrell, J. B., Mining Engineer. 



Tyson, Dr. James, Professor of Medicine. 



Weed, W. H., U. S. Geologist, Washington, D. C. 



Wheeler, Alvin Savage, Ph.D., Associate Pro- 

 fessor of Organic Chemistry, University of North 

 Carolina, Chapel Hill, N. C. 



Williston, Dr. Samuel W., Paleontology. 



Winslow, Charles E. A., Instructor in Biology. 



Witmer, Dr. L., Assistant Professor of Psychol- 

 ogy, University of Pennsylvania. 



Woods, Dr. James Houghton, Instructor, Har- 

 vard University. 



Wyeth, Dr. John A., Surgeon. 



WjTcnan, Dr. Walter, Surgeon-General, Marine 

 Hospital Service. 



SCIENTIFIC BOOKS. 

 Quantitative Classification of Igneous Rocks, 

 hased on chemical and mineral characters 

 with a Systematic Nomenclature. By 

 Whitman Cross, Joseph P. Iddings, Louis 

 V. PiRSSON and Henry S. Washington; 

 with an introductory review of the develop- 

 ment of Systematic Petrography in the 

 nineteenth century, by Whitman Cross. 

 The University of Chicago Press. 1903. 

 Pp. 286. 



During the past year there have appeared 

 in the Journal of Geology a series of papers 

 dealing with the various aspects of petro- 

 graphical classification. These, which really 

 form parts of a continuous treatise, have been 

 gathered together in the present volume. A 

 series of tables and a glossary have been 

 added, the whole forming one of the most 

 valuable contributions to systematic petrog- 

 raphy which has as yet appeared. 



Few sciences have shown a more rapid de- 

 velopment than the science of petrography. 

 One hundred years ago the distinction had 

 not been drawn between a rock and a geolog- 

 ical formation, and many very fine-grained 

 rocks were regarded as minerals and were 

 described as such. Thus basalt was supposed 

 to be a mineral species and its columnar 



