16" 2 Scientific Intelligence. 



tical chemists in the two previous editions, issued in 1904 and 

 1910, that it seems only necessary to call attention to the appear- 

 ance of this new edition. The general plan and scope of the 

 book remain unchanged ; the fullness of detailed instructions for 

 the carrying out of analytical processes is the same, and many 

 valuable suggestions are made whereby time and effort may be 

 saved. 



In addition, however, new analytical methods, or improve- 

 ments of older ones, are added, as well as complete details for 

 the estimation of more of the rarer elements in rocks. With this 

 work at hand the chemist, or petrologist, who has had some 

 training and experience in analytical work, need have no fear, 

 if he follows the orderly plan laid down with fidelity, but that 

 his results will be of a high order of excellence. 



Moreover, the book is an excellent one to put into the hands 

 of the student, when he has made some little progress in analy- 

 tical chemistry, and is ready to undertake the analysis of a 

 silicate. It has, indeed, been written quite as much from the 

 standpoint of helping the beginner, as of providing methods for 

 the skilled analyst. The details of methods are, therefore, more 

 fully treated than in the former editions, while possible errors 

 are thoroughly considered. The book should have a place in the 

 working reference library of every analytical laboratory, as well 

 as in that of the petrologist. l. v. p. 



3. A Source Booh of Biological Nature-Study ; by Elliot 

 Rowland Downing. Pp. xxi, 503, with 338 figures. Chicago, 

 1919 (University of Chicago Press). — This is one of a series of 

 guides for teachers of nature studies in the secondary schools 

 and for students in normal schools and schools of education who 

 are preparing for such teaching. The volume is filled with 

 practical information about common forms of life, with useful 

 suggestions for imparting this information to the pupils in such 

 a manner as to stimulate their observation of their surroundings. 



The teacher is shown how to guide the pupil in acquiring a 

 personal acquaintance with the animals of pond and stream, and 

 with insects, birds, pets, flowers, weeds, trees, seeds, garden 

 crops and fungi. The utilitarian aspects of the subject are 

 emphasized at all times and the pupils encouraged to put their 

 knowledge to practical use in their homes and in the community 

 generally. Such training as is implied by studies of this char- 

 acter can hardly fail to encourage in the pupil a sense of respon- 

 sibility for the public welfare and an ambition to become a useful 

 as well as an intelligent citizen. w. r. c. 



4. Problems of Fertilization; by Frank Rattray Lillie. 

 Pp. xii, 278, Chicago, 1919 (University of Chicago Press). — The 

 author has rendered a conspicuous service to biology in present- 

 ing in this convenient form a summary of his own studies in a 

 field in which he has long been a leading investigator. 



The philosophical significance of fertilization/ the morpho- 



