APPENDIX I. 



NOTICES OF BOOKS. 



Text-Book of the Diseases of Trees. By Professor R. Hartig. Translated by William 

 Somerville, D.CEc. , B.Sc. , F. R.S. E. , F. L.S. Revised and edited with a Preface by 

 H. Marshall Ward, D.Sc., F.R.S., F.L.S., F.R.H.S. Macmillan & Co., 1894. 



Few names have become more intimately indentified with any special branch of scientific 

 inquiry than has that of Hartig with Vegetable Pathology, and more particularly with that 

 section of it which relates to the diseases of forest trees. It is with great pleasure then that we 

 welcome the translation of the well-known German text-book on this subject. No one is 

 more thoroughly qualified to command attention in this department than Professor Hartig 

 himself, for it is in no small degree owing to the magnificent work which has been 

 accomplished by him, that Forestry has become raised to the rank of a science which has 

 successfully established its claim to recognition wherever the management of timbered estates 

 is intelligently conducted. 



It is greatly to be hoped that the appearance of an English edition of the Lchrbuch may 

 serve to promote a more active interest in the whole subject, and that it may in so far prove 

 effective in overcoming the ignorance and mismanagement which unfortunately still characterise 

 the administration of most of the woods and forests in this country. 



The book treats mainly of the injuries caused by parasites (chiefly fungi) to timber ; and 

 a brief account of the life history of these is usually given, in so far as it is of interest from the 

 point of view of pathology. Furthermore, remedial measures are frequently indicated, so 

 that not only is the book likely to be of use to the student, but it should also prove of indis- 

 pensable value to the practical forester who has woodlands and forests under his charge. 



A Pocket Flora of Edinburgh and the Surrounding District. By C. O. Sonntag. 



Williams & Norgate, 1894. 



This little book may prove useful to persons who wish to become acquainted with the 

 plants of the Edinburgh district. The area dealt with includes a considerable portion of East 

 Scotland south of the Firth of Forth. Keys to the natural orders and genera are given, and 

 to the description of the species, localities and period of flowering are appended. 



The Genus Salpa. By W. K. Brooks, Ph.D., LL.D., Professor in the Johns Hopkins 

 University, and Director of its Marine Laboratory. Baltimore : Johns Hopkins 

 Press, 1893. 



This magnificent and important work of 396 pp. , quarto, with 57 coloured plates, is the 

 second memoir from the Biological Laboratory of the Johns Hopkins University. It is 

 based upon the study of material for the greater part gathered and preserved at sea, by 

 persons in charge of vessels of the U.S. Fish Commission ; and the author acknowledges his 

 indebtedness to the " Bache " Fund of the National Academy of Sciences. The monograph 

 fulfils the promise of its author's earlier papers on the same subject. It opens with an 

 introduction, in which the history of investigation of the genus, and its gross structure, haunts, 

 habits, and physiology are, in turn, considered ; and then follow three sections dealing with 

 (i.) The Life-History of Salpa; (ii.) The Systematic Affinity of the Genus in their relation to 

 the Conditions of Primitive Pelagic Life, the Phylogeny of the Tunicata, and the Ancestry of 

 the Chordata, and (iii.) The Sexual and Asexual Development of Salpa. The leading refrain 

 of the work is the acquiescence, with modification, to Grobben's conclusion that Pjrosoma, 

 Doliolum, and Salpa are closely related forms, which have had a Compound Ascidian 

 ancestry ; but the author is of opinion that the ancestor did not possess the characters of any 

 modern group. In having discovered (i.) that both in Doliolum and Salpa the variations of 

 the muscular bands are such as to render untenable the subdivision into " Cyclomyaria " and 

 " Desmo {Hemi) myaria " ; (ii.) that the " elaeoblast " of Salpa is homologous with the tail of 

 Doliolum, the author has materially strengthened this position, not a new one for these two 

 genera. He emphasises the fact that the young Salpa, especially in respect to its apertures, 

 is much like a fixed Ascidian. Showing reason for regarding the "embryo" of Salpa as a 



B 



