Descendenz u. Hybriden. — Morphologie etc. — Physiologie. 5 



Glaser, 0. C, Autonom y, Regeneration, and Natura! 

 Selection. (Science, Vol. XX, p. 149— 153. ju!y 29, 1904.) 

 A discussion of these two processes in reiation to the 

 question of natural selection as suggested by Prof. T. H. 

 Morgan's writings. The author agrees with Morgan as to the 

 inadequacy of selection to explain the facts, but for different 

 reasons. H. M. Richards (New York). 



Maiden, J. H, The variability of Eucalyptus un der culti- 

 vation. Part 1. (Proceedings of the Linnean Society of 

 New South Wales for 1903. Vol. XXVIll. Part 4. No. 112. 

 1904. p. 887—1903. 



Owing to the Variation, which takes place in cultivated 

 species of Eucalyptus and which is most marked outside of 

 Australia, numerons new species have been described. In 

 the present paper these forms are discussed and where it is 

 evident that the names cannot stand, the species. to which they 

 must be referred, are mentioned; they are considered under 

 k>ur sections viz. species-names given to cultivated specimens 

 by old authors, those given by Naudin and others to French 

 and Algerian specimens, those given to American specimens 

 and those given to cultivated reputed Eucalyptus hybrids. 



F. E. Fritsch. 



Vribs, H. de, The Evidence of Evolution. (Science, Vol. 

 XX, p. 395—401. Sept. 1904.) 



An address delivered at the University of Chicago Con- 

 vocation, on Sept., 2'"' 1904. Considers/in a broad way, the 

 Darwinian concept of descent and its reiation to the Mutation 

 theory. Intimates that the real significance of the newer idea 

 lies not so much in its Substitution for the older, as in its 

 importance in pointing out new lines of research. 



H. M. Richards (New York). 



Magnus, lieber einige monströse Birnen. (Gartenflora. 

 1904. p. 3.) 



Der Blüthenspross hat hier verschiedene Blätterkreise an- 

 gelegt ehe er mit einem dem normalen Kelche ähnlichen Blatt- 

 kreise abschliesst. Unter jedem dieser Blattkreise bildet sich 

 die Achse fleischig aus und bildet so mehrstöckige Birnen. 

 Diese Birnen bringen es nicht zur Bildung von normalen 

 Fruchtblättern. Jongmans. 



Bergen, J. Y., Transpiration of Sun Leaves and Shade 

 Leaves of Olea europaea and other Broad-leaved 

 Evergreens. (Bot. Gaz. Vol. XXXVIII. p. 285—296. 

 11 fig.' in text. Oct. 1904.) 



Under their natural conditions, sun leaves transpire from 



three to ten times as much as do shade leaves. Under similar 



