LIXNEAN SOCIETY OF LONDOX. 65 



G-netaceeii' in octavo, with a quarto atlas of plates, and in 1873, 

 his briefly entitled " Ueber Azolla." 



In 1S75 came out his " Ueber Zellbildung und Zelltheilung,'' 

 which reached the second edition the next year, and the third 

 in 1S80, besides versions in other languages. From this time 

 onward, Strasburger was the foremost worker in botanic cytology, 

 and his labours, extending over 35 }'ears, have proved extra- 

 ordinarily fruitful. 'Ueber Befruchtung und Zelltheilung' 

 came before the world in 1876, as did his ' Studien iiber Proto- 

 plasma.' His next important work was ' Die Angiospermen und 

 die Gymnospermeii,' in 1879. 



Prof. Johannes von Hanstein, who had succeeded to Schacht's 

 chair at Bonn, after Strasburger had settled at Jena, died on the 

 27th August, 1880, and the latter was called upon to succeed him 

 early in the following year, after 12 years' labour at Jena. In 

 April of 1882 he produced ' Ueber den Ban und das Wachsthum 

 der Zellhaute,' which work he described as in part three years 

 old, thus in some measure the result of his work in Jena. 



JSoon afterwards he addressed himself to a wider circle and to 

 younger students, by issuing ' Das botanische Practicum ' early 

 in 1884, a work which attained its 4th edition in 1902 (of which 

 a sunnnary has gone through many editions), and was translated 

 by Prof. Hillhouse as ' Handbook to Practical Botany ' in 1886. 

 Later in the same year, he brought out his ' Neue Untersuchungen 

 Uber den Befruchtungsvorgang bei den Phanerogamen als Grrund- 

 lage fiir eine Theorie der Zeugung.' 



In 1889 began his important series of researches, published 

 under the name of ' Histologische Beitriige,' of which seven parts 

 came out under these titles : — 



1. Ueber Kern- und Zelltheilung im Pflanzenreiche, nebst einem 



Anhang iiber Befruchtung. 1888. 



2. Ueber das Wachsthum vegetabilischer Zellhaute. 1889. 



3. Ueber den Bau und die Verrichtungen der Leitungsbahneu in 



den Pflanzen. 1891. (He was accustomed to speak of this 

 volume of 1000 pages as " mein grosses Buch.") 



4. Ueber das Verhalten des Pollens und die Befruchtungsvor- 



giinge bei den Gymnospermen — Schwarrasporen, Gameteu, 

 pflanzlichen Spermatozoiden und das Wesen der Be- 

 fruchtung. 1892. 



5. Ueber das Saftsteigen. — Ueber die Wirkungssphare der 



Kerne und die Zellgrusse. 1893. 



6. Ueber Reduktiontheilung, Spindelbildung, Centrosomen und 



Cilienbildner im PHanzenreich. 1900. 



7. Zeitpunkt der Bestimmung des Geschlechts, Apogamie, Par- 



thenogenesis und Reduktionstheilung. 1909. 



On the occasion of his assuming office as Rector of Bonn 

 University, in October, 1891, he delivered an address, which was 

 issued as ' Das Protoplasma und die Keizbarkeit.' 



LIXN. SOC. PROCEEDINGS. — SESSION 1911-1912. / 



