

154 BOTANICAL GAZETTE [februah 





for example in the Compositae, the illustrations have apparently suffered some- 

 what in the process of reproduction; thus for instance in the genus Crepis the 

 illustrations, as reproduced, add little or nothing to the text. In general, how- 

 ever, the illustrations are excellent, and one only regrets that they are not more 

 numerous. 



The presswork is exceptionally good; there are few typographical errors. 

 On page 500, however, "Abizzia" occurs instead of Albizzia, which is evidently 

 a misprint. 



The value of this work as a textbook should not be overlooked. The dis- 

 criminating text and complementary illustrations present the subject-matter in 

 a satisfactory way for teaching purposes. The illustrations themselves are for 

 the most part insufficient for the hasty determination of the species by the student. 

 and they can be used to advantage only in connection with the brief but clear 

 descriptions. In this regard the book has no equal. 



On the whole this new edition of the well-known Gray's Manual presents 

 a flora of the central and northwestern United States, and adjacent Canada in 



revised 



incorporating 



accords with the most advanced and universally accepted views of taxonomy. 



J. M. Greenman 



Heredity 



j 



k T2 



of the 



University of Aberdeen, "is intended," as the preface states, "as an introduction 

 to the study of heredity." The writer has long been known as the joint author 



/ 



Weismannism 



zed as 

 Are- 



Mew ot such a book in a botanical journal needs no apology, for much of the more 

 recent work in heredity has been done with plants, and moreover the book deals 

 with those general fields of biological research which must always be of equal 



botanists 



— ~ ailu ^wiugisis. inese ftelds will ever be tne mecuug &— 

 of botany and zoology, because in this class of problems the organism is treated 



portance 



' - ««M.iiia apiani or an animal is ot minor lmpuxiauw. 



The work is divided into fourteen chapters, and among the topics dealt with 

 may be mentioned the physical basis of inheritance; heredity and variation; 

 reversion; telegony; transmission of acquired characters; statistical and experi- 

 mental study of inheritance; theories of heredity and inheritance; heredity and 

 sex; and a final chapter is devoted to the social aspects of biological results. 



Heredity and inheritance are defined as follows (p. 13): "By 'heredity' ** 

 do not mean the general fact of observation that like tends to beget like, nor * 



to be oppo 



sed to the 



P^^varying-nor anything but the organic or genetic relation between sitcces- 



p^w' L5TLS2L pp - .-+«* ** *• New Yort: G ' '' 



