May 30, 1913] 



SCIENCE 



839 



Principles of Economic Zoology. By L. S. 

 Daugherty, M.S., Ph.D., Professor of Zool- 

 ogy, State Normal School, Kirksville, Mo., 

 and M. 0. Daugherty, Kirksville, Mo. 

 Philadelphia and London : W. B. Saunders 

 Company. 1912. Cloth, 12mo. Pp. 410. 

 301 illustrations. $2.00 net. 

 This recent text-book presents a number of 

 commendable features and adds another to the 

 rather numerous list of available text-books 

 for the beginner in zoology. It seems more 

 particularly adapted for the normal school 

 work in which the authors are engaged, and 

 this perhaps accounts for the effort to include 

 a very large number of examples rather than 

 to give a more detailed and exact description 

 of representative forms in the principal groups 

 of animals. Possibly the great number of 

 forms mentioned would be confusing, but in 

 the hands of a skillful teacher the book could 

 certainly be very useful in the extending of 

 acquaintance with animal forms in general. 

 The economic feature of the work, which has 

 been emphasized in its title, will make it wel- 

 come in many schools where attention to this 

 phase of the subject is desired. While these 

 references are usually brief they generally 

 sum up in fairly compact form the more 

 important economic points, and are quite sug- 

 gestive for references to more extended works 

 in this field. 



The illustrations are numerous, usually well 

 selected and very well printed, and add a very 

 important feature to the book. 



One point which seems somewhat of a blem- 

 ish is the inclusion of a discussion of eco- 

 nomic or other matter referring to an entirely 

 different class under a sub-heading which is 

 restricted to some minor division of the group, 

 for example pages 40, 44 and 70, the discus- 

 sion of economic importance included in a 

 paragraph under minor classes in the branch, 

 relate for the most part to species included in 

 entirely different classes and without especial 

 attention of the student might very likely be 

 supposed to refer to the class in which the 

 paragraph occurs. This fault is one which 

 might easily be corrected by a different ar- 

 rangement of sub-headings. 



The substance in general seems to be care- 

 fully stated and while there are some errors, 

 due no doubt to lack of first-hand knowledge, 

 the preparation shows care, and while stated 

 to be essentially a compilation, the authors 

 are to be commended for the success shown in 

 selection and presentation of material. 



In typographical respects the book is very 

 satisfactory and a credit to the publishers. 



Herbert Osborn 



TUB MINEEAL WEALTB OF CANADA 



Although the discussion of reciprocity with 

 Canada is now quiescent, yet all citizens of the 

 United States are naturally interested in the 

 development of our sister country. This ia 

 especially true of the readers of Science, be- 

 cause Canada has given to this country such 

 a large number of eminent, iniiuential and 

 successful educators and scientists. 



A recent publication of the Canadian De- 

 partment of Mines gives us many items re- 

 lating to the mineral wealth and to some of 

 the resulting manufactures that ought to be 

 of importance to our own people. This work 

 is entitled " A General Summary of the Min- 

 eral Production of Canada during the Cal- 

 endar Year 1911," by John McLeish, B.A., 

 chief of the Division of Mineral Resources 

 and Statistics. 



From this we learn that the total value of 

 the mineral products of Canada in 1911 was 

 $103,220,994, or $14.42 per capita. The pro- 

 duction was distributed amongst the various 

 Canadian provinces arranged in order of the 

 values as follows: Ontario, $42,796,162; Brit- 

 ish Columbia, $21,299,305; Nova Scotia, $1.5,- 

 409,397; Quebec, $9,304,717; Alberta, $6,662,- 

 673; Yukon, $4,707,432; Manitoba, $1,791,- 

 772 ; Saskatchewan, $636,706 ; and New Bruns- 

 wick, $612,830. 



Of these mineral products the metallic were 

 valued at $46,105,423; the non-metallic at 

 $57,115,571, of which $22,709,611 were for 

 structural inaterials and clay products. 



As a matter of comparison it is here pointed 

 out that for the same year 1911 the mineral 

 products of the United States, according to our 



