THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



«* per litora spargite museum, 



Naiades, et circum vitreos considite fontes : 

 Pollice virgineo teneros hlc carpite flores : 

 Floribus et pictum, diva?, replete canistrum. 

 At vos, o NymphzB Craterides, ite sub undas ; 

 Ite, recurvato variata corallia trunco 

 Vellite muscosis e rupibus, et mihi conchas 

 Ferte, Dea? pelagi, et pingui conchylia succo." 



N.Parthenii Giannettasii Eel. 1. 



No. 116. JULY 1846. 



I. — On the Circulation of the Sap in the Interior of Cells. 

 By Hugo Von Mohl*. 



IN a series of observations which I made in the course of last 

 summer on the development of the vegetable cell, the results of 

 which it is my intention to communicate on a subsequent occasion 

 when they have been rendered more complete by further inves- 

 tigation, my attention was directed to the phenomena presented 

 by the nitrogenous constituents of the contents of the cell. I 

 had for years endeavoured to obtain a clear insight into the suc- 

 cession of the metamorphoses these substances, which are con- 

 stantly changing their form, undergo during the development of 

 the cells ; but I could not succeed in making out a fixed rule in 

 this respect, not knowing how to separate sufficiently the indi- 

 vidual and accidental phenomena from those of constant occur- 

 rence. Now although the more recent investigations I have 

 made have not presented me with any appearances which I had 

 not frequently seen before, yet I think I have obtained a definite 

 result, insofar as these observations prove that the successive 

 changes of the nitrogenous substances take place in the great 

 majority of vegetable cells in a perfectly analogous manner. 

 If we consider the place at which, in the interior of a cell, new 



* Translated from the Botanische Zeitung for Jan. 30, and Feb. 6, 1840. 

 Ann. $ Mag. N. Hist. Vol. xxiii. B 



