779 



Number 4. 



On Sagina ciliata, Fr., and S. apetala, L. By F. Beneken. 

 [Translation from the ' Botanische Zeitung.' The purport of the pa- 

 per is to establish the identity of these two alleged species.] 



Abnormal Morphology. By Hewett C. Watson, Esq. 



On a Transformation of the pericha3tial part of the Mosses. By 

 C. Muller. [Translation from the ' Botanische Zeitung.'] 



Literature. Proceedings of Societies. Miscellanea. 



Number 5. 



On the Causes which limit the Distribution of Plants in the North 

 of Europe and analogous Regions. By Alph. De Candolle. [Ab- 

 stract of a paper published in the ' Annales des Sciences Naturelles.' 

 The author recognizes heat as the grand cause, but considers that the 

 true mode of reading its effects is, by reckoning up the sum of heat re- 

 quired during the period of growth for the species ; the length of time, 

 and the height of the thermometer, being in an inverse ratio ; more 

 heat for a shorter time, being equivalent to less heat for a longer 

 time. We fear that there is a fallacy of reasoning here, although 

 the view is founded in truth.] 



On the Rubus nitidus of Authors, and some other Species. By 

 Charles C. Babington, M.A. 



Contributions to the History of certain Cultivated Plants. By Dr. 

 Fraas. [Translation from the ' Botanische Zeitung.'] 



Literature. Proceedings of Societies. Miscellanea. 



Number 6. 



On the Transformations of the Flora of Central Europe during the 

 Tertiary Period. By M. V. Raulin. [Translation from the 'Annales 

 des Sciences.'] 



Vegetation of the Upper Regions of the Nile. From M. Fred. 

 Werne's Account of Mehemet Ali's Expedition to the White Nile. 



Literature. Proceedings of Societies. Miscellanea. 



Number 7. 



Observations on Viscum album. 



On the Periods of Vegetation of Winter Rye and Wheat, from the 

 Flowering to the ripening of the Seed. By G. Lucas. [Translation 

 from the ' Botanische Zeitung.'] 



