152 BOTANICAL GAZETTE [august 



place as opening up new fields of research in immunity. The specificity of the 

 phenomena accompanying the formation of agglutinins and precipitins is 

 brought to the attention of the reader, and their diagnostic value is discussed 

 pro and con. The crowning theory of immunity, Ehrlich's side -chain theory, 

 is then taken up at some length and its paints of contact with Metchntkoff's 

 theory brought to light. 



The difficult task of discussing the important subject of immunity has 

 been ably executed and a large amount of information is given in this book. The 

 author has done justice to the various workers who have contributed to the develop- 

 ment of modem views, and has striven to bring into harmony to some extent the 

 opposing opinions of different factions. The subject is much condensed, in 

 some instances almost too much so, yet without seriously interfering with clearness 

 and conciseness. The volume is admirably suited for those students who wish 

 to obtain a general insight into the subject without going into detail. A complete 

 list of the literature enables the student to investigate any particular subject he 

 may be interested in. — P. G. Heixemann. 



MINOR NOTICES 



North American Uredineae. — In Part III of the first volume of this work, 

 HoLWAY^ continues his presentation of Puccinia in the order of hosts, concluding 

 Leguminosae and extending through Halorrhagidaceae. The species numbers 

 extend from 84 to 120, including three new species on Sidalcea, Viola, and Bois- 

 duvalia. The clear text and the excellent plates reproducing photomicrographs 

 of the spores make this monograph most attractive in appearance. — J. M. C 



Acta Horti Bergiani. — The fourth volume of this series,'^ under the editor- 

 ship of WiTTROCK, is dedicated to the bicentenary of Linnaeus. It contains 

 seven papers, illustrated by 24 plates, many of them handsomely colored, and 

 176 text figures, and deals chiefly with forms under cultivation in the Bergian 

 garden. Veit B. Wittrock (pp. 32) gives an account of the life and work of 

 Linnaeus, illustrated by three portraits. H. Dahlstedt (pp. 2^. ph. 2. figs. 8) 

 gives an account of seven new species of Taraxacum under cultivation. Nils Syl- 

 ven (pp. 8. pi. i) describes two Senecio hybrids. S. Almquxst (pp. 88. pi. i. 

 figs. 84) describes numerous forms of Rosa, many of them called mutations. 

 Gust. O. A:n Malme (pp. 16. pis. 4) describes forms of Victoria cruziana. 

 Ernst Almquist (pp. 92. figs. 66) describes and illustrates a surprising number 

 of elementary species of Capsella Bursa-pastoris, Veit B. Wittrock (pp. 187. 

 pis. I J. figs. 18) shows that Linnaea borealis is an exceedingly poljmorphic and 

 polychromic species, the latter fact appealing strikingly to the eye in the eight 

 handsomely colored double plates, nearly 150 new forms being described, — J. M. C. 



3 HoLWAY, E. W. D., North American Uredineae. Vol. I, Part III. pis. 24-36 

 Minneapolis, Minn. 1907. 



4 Kungl. Svenska Vctenskaps-Akademiens Tradgard Bergielund. Stockholm 



1907 



