Band 120. Nr. 15. XXXIII. Jahrgang. II. Bd. Nr. 15. 



Botanisches Centralblatt. 



Referirendes Organ 



der 



Association Internationale des Botanistes 

 für das Gesamtgebiet der Botanik. 



Herausgegeben unter der Leitung 

 des Präsidenten : des Vice- Präsidenten . des Secretärs: 



Prof. Dr. E. Warming. Prof. Dr. F. W. Oliver. Dr. J. P. Lotsy. 



und der Redactions-Commissions- Mitglieder : 



Prof. Dr. Wm. Trelease, Dr. R. Pampanini, Prof. Dr. F. W. Oliver, 



Prof. Dr. C. Wehmer und Dr. C. H. Ostenfeld. 



von zahlreichen Specialredacteuren in den verschiedenen Ländern. 



Dr. J- P. Lotsy, Chefredacteur. 



No.41. 



Abonnement für das halbe Jahr 14 Mark 



durch alle Buchhandlungen und Postanstalten. 



1912. 



Alle für die Redaction bestimmten Sendungen sind zu richten an: 

 Redaction des Botanischen Centr alblattes, Haarlem (Holland), Spaarne 17. 



H. H. T. [Thomas, H. H.], On a MethodofSealingupthe 

 Cover-glasses of Preparations mounted in Glycerine. 

 (New. Phyt. X. p. 105-106. 1 Text-fig. 1911.) 



This method consists in the application of hot wax to the edges 

 of the cover-glass by means of a piece of thick copper-wire. The 

 wax (invented by Prof. Lagenhein) consists of hard parafin wax 

 (M. P. 55° — 66° C.) and mastic in equal parts. The mastic is melted 

 and the parafin added to it in small pieces; it is then stirred with 

 a piece of wood until homogeneous, when it is allowed to cool. The 

 wax is applied by means of a thick copper-wire, one end of which 

 is fixed in a wooden handle, while the other is bent at right angles. 

 The bent part, which should be rather longer than the length of 

 the cover-glass, is heated and dipped into the wax, and then 

 applied in such a way that the wax-covered wire lies along the 

 edge of the cover-glass. It at once solidifies and forms a neat Joint. 



Agnes Arber (Cambridge). 



Campbell, D. H„ The Embryo-sac of Pandanus. (Ann. Bot. 

 XXV. p. 773—789. pl. 49—50. 2 textfigs. 1911.) 



In Pandanus the embryo-sac reaches the highest development 

 before fertilization that has yet been recorded for the Angiosperms. 

 Instead of the eight nuclei of the ordinary embryo-sac, there are 

 at least thirty-six, and sometimes twice that number, at the time 

 fertalization occurs. 



The early divisions of the embryo-sac follow the usual course 



Botan. Centralblatt. Band 120. 1912. 25 



