Anatomie. — Biolooie. — Varietäten etc. 101 



Die Korkzellen der von Croton Elecieria Benn. stammenden 

 Cascarillannde haben stark verdickte, zuweilen hufeisenförmig ver- 

 dickte Aussenwände und relativ dünne, mit zahlreichen kleinen 

 stäbchenförmigen, hendyoedrischen oder andersgestalteten Einzel- 

 krystallen aus Kalkoxalat inkrustierte Innenwände. 



3. Die Deckhaare der Pigmentfrüchte und der Myrtaceen über- 

 haupt. 



Die Doppelhaarnatur der Trichome hat Verf bei folgenden 

 Myrtaceen nachweisen können : bei Pinienta ojf., Callistenion sp., 

 Kunsea ericif., Leptospermunt grandif. Hort., Metrosiderostoni. A. Rieh, 

 und Psidiuni Guajava L. 



Für die Myrtaceen-Tr\z\iova& ist nach den Angaben des Verf. nicht 

 so sehr die scheinbare Verdoppelung charakteristisch, als vielmehr 

 das Vorhandensein einer cuticularisierten Wandlamelle im Inneren 

 der Haarwand. Eine Verdoppelung des Haarkörpers ist nicht vor- 

 handen bei Eugenia correaefolia. Denys (Hamburg). 



Needham, G., General Biolog y. (The Comstock Pub. Co. 

 Ithaca, N. Y. 530 pp. 9 pl. 287 fig.^1910.) 



A book designed especially for College students who can spend 

 but one year in ßiology. Not intended as formal text or treatise, 

 but as a guide to assist in acquiring a well balanced knowledge of 

 plants and animals it nevertheless covers a wide ränge and devotes 

 considerable attention to some important phases of biology which 

 are not always included in a book of this kind. The chapter headings 

 are: The Interdependence of Organisms, The Simpler Organisms, 

 Organic Evolution, Inheritance, The Life Cycle, The Adjustment of 

 Organisms to Environment, and The Responsive Life of Organisms 

 and indicate the general scope of the work. Each chapter is followed 

 by a number of „practical exercises" which for the most part have 

 to do with field and general experimental studies rather than 

 laboratory work. The book is profusely iliustrated with textfigures and 

 has eight half-tone plates of noted Biologists. Trelease. 



Darbishire, A. D. Recent Advances in the Study of Here- 

 dity. (New Phytologist. VIII. p. 157 — 180, 237—248, 273—383, 

 319—336; IX. p. 1—18.. 1909/10.) 



A course of lectures delivered in the University of London. 

 In the introductory lecture the author traces, in outline, the history 

 of the study of inheritance. 



He procedes to outline the Mendelian phenomena, illustrating 

 them principally by reference to the results of experimental work 

 upon Peas: he then gives Mendel's hypothesis and discusses the 

 nature of the allelomorphic pair. In a consideration of the 1 : 2 : 1 

 and the 9:3:4 ratios the question is raised whether all cases of 

 1:2:1 may not in reality be of the 9:3:4 type; from this stand- 

 point the author developes the idea that the phenomenon of domi- 

 nance may be merely a t3^pe of reversion. 



In the sixth and seventh lectures the author deals with the 

 Mendelian inheritance of sex and with the cytological and other 

 evidence relating to the inheritance of sex. 



In the last lecture the author returns to the consideration of the 

 theory of ancestral contributions and, in giving a Statement of his 

 Position with regard to this theory, he replies to a criticism made 



