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DR D. H. SCOTT ON THE 



uppermost leaf of the three, B to the next, and C to the lowest. In the next section 

 (diagram 2) the same three orthostichies are represented. The bundle C has here moved 

 up nearly to the pith, but is still separated from it by a mass of radially arranged 

 parenchyma. B has moved but little inwards, and has scarcely changed. A is much 

 smaller than before, and has shifted in watch-hand direction, approaching an adjacent 

 small strand (a) on that side. In the next section below (diagram 3) a new bundle, D, 

 makes its appearance out in the wood, between A and B ; it evidently comes from a 

 leaf next below C, and thus gives the position of a new orthostichy. C has here just 

 reached the edge of the pith and B is projecting further into it. A is now scarcely 



DlAGKAM 1 (K. 788). 



larger than its fellow circum-medullary strands ; it has shifted a little further and is now 

 joining the adjacent strand, a ; it has also become embedded in the tissue of the pith. 



In the lowest section of the series (diagram 4) a new strand again, E, is entering 

 through the wood on the left, between B and C, thus fixing the position of the fifth 

 orthostichy, and clearly belonging to the lowest of the five leaves which are represented 

 by their traces in this series. D has here reached the edge of the pith ; C is beginning 

 to enter it, and is somewhat reduced in size ; B is much smaller than before, and has 

 entered the pith sufficiently to have been drawn away from the wood by the contraction 

 of the former. A, no longer distinguished by size, is still fusing with the adjacent 

 strand, a. 



The whole arrangement clearly points to a 2/5 phyllotaxis. The three successive 

 traces, which are alone recognisable in diagrams 1 and 2, are separated by angles which 



