a TEXT-BOOKS OF SCIENCE 



NBWCOMB'S POPULAR ASTRONOMY 



Popular Astronomy. By Simon Newcomb, LL.D., 

 Superintendent American Nautieal Almanac ; formerly 

 Professor U. S. Naval Observatory. With One Hun- 

 dred and Twelve Engravings and Five Maps of . the 

 Stars, pp. xviii., 578. 12mo, Cloth, $1 30 ; by mail, 

 $1 43. 



The historic and philosophic sides of the subject have been treated 

 witli greater fuluess than is usual in works of this character, while 

 the purely technical side has been proporlionately condeused. Some 

 of the most distinguished investigators in the world have presented 

 brief expositions of their theories on the constitution of the sun. 

 The woric states the latest methods of Investigation, the latest dis- 

 coveries, and the latest general developments in astronomy. 



WARREN'S RECREATIONS IN ASTRONOMY 



Recreations in Astronomy. With Directions for Prac- 

 tical Experiments and Telescopic Work. By H. W. 

 Warren, D.D. pp. xiv., 292. With 83 Illustrations 

 and Colored Plates. 13mo, Cloth, $1 25 ; by mail, 



*1 36. 



The explanations of difficult matters are particularly lucid, and 

 lor readers not technically instructed in astronomy nothing could be 

 better as a literary presentation of the attractive side of the science. 

 —N. Y. Post. 



BIOLOGY 



DODGE'S PRACTICAL BIOLOGY 



Introduction to Elementary Practical Biology. A La- 

 boratory Guide for High Schools and College Students. 

 By Charles Wright Dodge, M.S., Professor of Biol- 

 ogy, University of Rochester. Crown 8vo, Cloth, %\ 80 ; 

 by mail, II 95. A 'sample copy will be forwarded to 

 any teacher who may wish to examine it with a view to 

 class use on receipt of II 50. 



Professor Dodge's manual consists essentially of questions on the 

 siructure and tlie physiology of a series of common animals and 

 plants typical of their kind — questions which can be answered only 

 by actual examination of the specimen or by experiment. Direc- 

 tions are given for the collection of specimens, for their preservation, 

 and for preparing tliem for examination ; also for performing simple 

 physiological experiments. Particular species are not required, as 

 the questions usually apply equally well to several related forms. 



