Physiologie der Zellen, Gewebe und Organe. 355 



gested that the presence of the odd chromosome is concerned with the poUen 

 sterility of 0. lata and will also account for certain features of its behaviour on 

 Crossing. 



Certain variations in the chromosome number of different cells were accoun- 

 ted for in part through the precocious split and Separation of certain chromo- 

 somes in the i^rophase, as it was found that the chromosomes all regularly un- 

 dergo their fission in the prophase, the split afterwards closiug up again to 

 reappear in metaphase. 



It was found that when the chromosomes first originate from the reticulum 

 they are long, coiled, apparently unpaired threads, but later in the prophase 

 they usually became paired in arrangement. Another point of interest was the 

 median constriction of the chromosomes in the early telophase. Nothing resemb- 

 ling prochromosomes was observed. 



In two cells of the nucellus a peculiar mitosis resembliug a reduction divi- 

 sion was observed. The chromosomes retained the shape of somatic chromosomes, 

 but were closely in pairs or fused, these bivalents being peculiarly oriented on a 

 very large spindle. Gates (London). 



Hierzu: Nr. Iia2, 1133, 1137, 1151 — 1157, 1193—1195, 1197. 



Physiologie der Zellen, dewebe und Organe. 



1136) Blackledge, L. M. (Liverpool, University), Variations in the NaCl 

 content of non-halophy tes. In: Annais of Botany, Bd. 27, Heft 1, S. 168 

 ,bis 171, 1913. 



When non-halophytic plants are grown at different distances from the sea, 

 their leaves when analyzed are found to contain different quantities of NaCl. 

 This might be due to (I) variations in the amount of NaCl in the transpiration 

 current received from the soil-water, or (II) variations in the amount of NaCl 

 in the air and absorbed by the leaves directly. Experiments and analyses with 

 Äcrr pseuclo-platanus, Ulmus campcstris and Hex aequifolium lead to the conclusion 

 that the leaves of such plants derive their sodium chloride directly from the at- 

 mosphere. Gates (London). 



1136) Prianichuikow, D. (Petrovskoe, Inst. Agronomiquej, La synthesedes 

 Corps amides aux depens de l'ammoniaque absorbee par les racines. 

 In: Revue g. de Bot., Bd. 25, Heft 289, S. 5—13, 1913. 



Lorsque les plantes se developpent ä la lumiere, les phenomenes de Synthese 

 se produisent energiquement et conduisent rapidement ä la formation de corps 

 albuminoides, aussi est-il difficile de constater des differences dans la composi- 

 tion de la plante, provoquees par certaines modifications de la nutrition azotee. 

 A l'obscurite, les conditions sont beaucoup plus defavorables pour la Synthese 

 des matieres azotes, aussi peut-on observer, dans ce cas, les produits intermediaires. 



M. M. Kinoshita et Suzuki, en expe'rimentant avec les sels ammoniacaux, ont 

 conclu que leg plautes etiolees sont capables de transformer en amide, et notamment en 

 asparagine, l'ammoniaque qu'ils absorbent. M. Laurent a, d'autre part emis l'opinion 

 que sous l'action de la lumiere, la transformation de l'ammoniaque en asparagine ne se 

 realise pas. L'auteur a repris ces experiences, sous la forme la plus simple possible, en 

 cultivant des plantes dans Teau destillee d'une part et, d'autre part, sur des Solutions 

 contenant des sels ammoniacaux, sous forme de NH^Cl ou de S04(NH4)5, accompagne 

 lorsqu'il y a Heu de Coj Ca, dans le but de neutraliser l'acide forme. 



23* 



