Band 101. Nr. 16. XXVII. Jahrgang. 



Botaiiisclies Ceiitralblatt. 



Referirendes Organ 



der 



Association Internationale des ßotanistes 



für das Gesamtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten : des Vice- Präsidenten : des Secretärs : 



Prof. Dr. R. v. Wettstein. Prof. Dr. Ch. Flahault. Dr. J. P. Lotsy. 



und der Redactions-Commissions-Mitglieder : 



Prof. Dr. Wm. Trelease und Dr. R. Pampanini. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 

 Dr. J. P. Lotsy, Chefredacteur. 



No. 16. 



Abonnement für das halbe Jahr 14 Mark 

 durch alle Buchhandlungen und Postanstalten. 



1906. 



Alle für die Redaction bestimmten Sendungen sind zu richten an Herrn 

 Dr. J. P. LOTSY, Chefredacteur, Leiden (Holland), Rijn- en Schiekade 113. 



Thomson, R. B., Preliminary Note on the Araucarlneae. 

 (Science. Vol. XXII. 1905. p. 88.) 



A large number of nuclei occur in the pollen tube of Agathis and 

 more than 30 were observed in Araucaria. PoUination is unique among 

 Gymnosperms, the pollen falling upon the ligule and growing along the 

 surface for two or more centimeters before reaching the micropyle. The 

 anatomy of the ovule and development of the archegonia, as well as the 

 pollen tubes and megaspore membranes, indicate that the Araucarineae 

 occupy a very isolated position among the Coniferales. 



Charles J. Chamberlain (Chicago). 



Bateson, W., Presidential Address to the zoological 

 Section. (Brit. Assoc. for the Advancement of Science. 

 Cambridge 1904.) 



The address deals with recent progress in the investigation 

 of heredity, and with the results and prospects of these studies. 

 The methods and conclusions chiefiy emphasised are those 

 which are known as Mendelian, but an account is also given of 

 the progress towards the present position of the science of 

 evolution which preceeded the rediscovery of Mendel's work. 

 The author's position may be gathered from the following 

 selected passages. 



„Operating among such phenomena the gross Statistical 

 method is a misleading instrument; and, applied to these intricate 



Botan. Centralblatt. Band 101. 1906. 26 



