258 Allgemeines. 



and coniirm the laws enunciated by Mendel, tend to shew 

 that these laws are only special cases of more general ones 

 yet to be discovered. The evidence furnished by Mendel and 

 by more recent investigators seems to point to a „theory of 

 heredity oi the type of Darwin's Pangenesis in the form lately 

 put forward by De Vries". 



After pointing out that Weldon's view that „the be- 

 haviour of the character of a hybrid is dependent on the 

 ancestry of the parents" is not universally true, the author 

 proceeds to summarize the observations of Correns and 

 Webber on the direct effect of the pollen on the fruit of 

 Maize. The paper concludes with a reference to the views of 

 Correns and Strasburger as to the means by which the 

 schizogonous characters are separated in the sexual cells and 

 the time at which the Separation occurs. — a bibliographical 

 list accompanies the paper. h. H. W. Pearson (London). 



Campbell, Douglas, Houghton, A University Text Book of 

 Botany. 579 pp. New York (The Mac Millan Co.) 1902. 



The present volume is the first „University Text Book of 

 Botany" to appear in America. In it, „An attempt has been made 

 to present, in as compact a form as possible an outline of the 

 essentials of modern botany". Being designed primarily as a 

 work of reference, as the author states in his Preface, no 

 attempt has been made to introduce laboratory exercises. 



The arrangement of the chapters and the space devoted 

 to them is as follows: 



I. Introdu c tio n , 11 pp v IL The Plant Body, 21 pp., III. The 

 Plant Cell, 31 pp., IV. Classification, 25 pp., V. The Algae, 

 56 pp., VI. The Fungi, 44 pp., VII. The Archegoniatae 56 pp., VIII. 

 Pteridophyta (Ferns), 81 pp., IX. Pteridophyta (Concluded), 27 pp., X. 

 Subkingdom Sperrnatophyta (S ee d -P 1 a nt s), 25 pp., XL Angiosper- 

 mae (Metaspermae), 51 pp., XII. Subclass IL Dicotoledons, 60 pp., XIII. 

 Physiology, 33 pp., XIV. Relation to Environment, 33 pp., 

 XV. Geo logical and Geographica 1 Distribution,, 20 pp. There 

 is an index of 26 pages. 



In Chapter I, a variety of subjects of an introductory nature are 

 discussed, such as. „Organic and Inorganic Bodies", „Protoplasm", 

 „Structural Resemblences in Plants and Animals", „Motility in Animals", 

 „Taxonomy", „Geological Distribution". 



Morphology seems to be treated in the second Chapter of 21 pages, 

 the main headings being: „The Plant Cell", „Reproduction", „Unicellular 

 Plants", „Filamentous Plants", „The Thallus", „Root and Shoot", „Vas- 

 cular Plants", „Branching", „Symmetry", „Organs of Vascular Plants", 

 „The Stern" (Caulome), „The Leaf", „The Root", „Trichomes", „Emer- 

 gences", „The Reproductive Parts", „Morphology and Classification". 



In the Chapter on the Plant Cell (III), is contained the histological 

 and cytological part of the work, treating such subjects as: „Physical 

 Properties of Protoplasm", „Differentiation of the Protoplast", „Physical 

 Constitution of Protoplasm", „Irritability", „Reproduction", „The Typical 

 Plant Cell", „Chromatophores", „The Cell Wall", „Inclusions of the Pro- 

 toplast", „Forms of Cells", and „Cell Formation". 



From the title, „Classification", one might assume Chapter IX to 

 be a discussion of the principles and objects of Classification, but after 

 about three pages which might seem to be of this character, the author 



