82 Anatomie. — Morphologie etc. 



related to the size of the seed, so that these anatomical characters 

 are of little value in solving pliylogenetic problems. 



5. The arboreal habit is probably primitive in the Leguminoseae , 

 the herbaceous derived, and the production of large seeds and seed- 

 lings is correlated with the tree habit. 



6. The Stahle type of tetrarchy is typical in the large seedlings 

 and is probably primitive for the family. Reduction in size of seed- 

 ling brings about an unstable tetrarch}', passing into triarch}' and 

 diarchy in connection with the supplementary relation existing 

 between the inter-cotyledonary protox3dems and the early plumular 

 traces. Diarchy when attained is stable. 



7. Characters of seedling structure to a limited extent may be 

 of diagnostic value, "but it is exceedingl}^ risky to apply them to 

 solve the broader problems of phylogeny." E. de Fraine. 



Compton, R. H., Theories ofthe anatomical transition 

 from root to stem. (New Phyt. XI. 1. p. 13—25. l fig. 1912.) 



This paper gives a historical and critical account of the various 

 theories which have been held in connection with the subject of 

 Seedling Anatomy. The work of Van Tieghem, Gerard, Bon- 

 nier, Sterckx, Miss Thomas, Chauv eaud and others is discussed, 

 and the various methods visualising the processes involved in the 

 transition are shown by means of comparative diagrams. 



Agnes Arber (Cambridge). 



Gerry, E., The Distribution of the 'Bars of Sanio' in the 

 Coniferales. (Ann. Bot. XXIV. p. 119—123. 1 pl. 1910.) 



'Bars of Sanio' occur in 35 of the living genera of the Conife- 

 rales. but they are absent in ^4,§-a//i/s and ^/'«//mn«. This distribution 

 is confirmed by fossil evidence which shows the bars to be absent 

 in Conifers of Araucarian affinities. Agnes Arber (Cambridge). 



Bottomley. W. B., The Root-nodules of Mvrica Gale. (Ann. 

 Bot. XXVI. No. 101. p. 111 — 117. Jan. 1912.) 



Some account is given of the literature on root-nodules in gene- 

 ral and that on Myvica Gale in particular. The latter nodules are 

 modified lateral roots which branch forming the "Cluster" nodules. 

 In the mature nodule four zones are evident: 1. Meristem zone. 2. 

 Infection zone. 3. Bacterial zone. 4. Basal zone. In old nodules fungal 

 hyphae occur, possibly m5^corrhizal in nature. Culture experiments 

 were made with the bacteria, which were found to be identical in 

 structure and growth with Pseudomonas radicicola, the organism of 

 the Leguminous root-nodules. It is concluded that the root-nodules 

 of Myvica Gale are definitely eoncerned with Nitrogen assimilation 

 and that the bacteria in the bacterial zone of the nodule are the 

 active agents in nitrogen fixation. W. E. Brenchle3\ 



Gates, R. R.. An Onagraceous stem without Internodes. 

 (New Phyt. XI N« 2. pp. 50—53. 2 pl. 1912.) 



In this paper attention is drawn to a curious experimental result 

 obtained in the course of some analytical cultures of Onotheras 



