43 



the thirty-four vertical ranks and the right- and left-hand sec- 

 ondaries of Zone V were plotted at the top. Below this — but 

 with a gap between left for the as yet undeciphered transition — 

 there was made a similar plot of the thirteen-ranked Zone III. 

 These were the only portions of the record so far positively iden- 

 tified and understood. All else was uncertain. 



2. The bridge between these two was obviously the next thing 

 to attack. For not only were both its abutments already in place, 

 but the \Vhole record of its construction was there in plain view 

 on the trunk of almost every adult tree of its kind, though as yet 

 we could not read it. All attempts however to devise a scheme 

 which should result in a pattern at all like that of the record were 

 unavailing, until at last the significance of the increasing pitch of 

 the 13-ranked secondaries as they curve downward from Zone 

 V was apprehended.* They curve in order to meet and merge 

 themselves tangentially in the vertical ranks of Zone IIL After 

 that it was not difficult to discover the right curve and to plot the 

 girders which were to connect the abutments of the bridge. Leaf- 

 stations then were marked throughout the three zones, and lines 

 of provisional numbering were established as basis for the final 

 numbering of the whole when the plot of Zones I and II should 

 be completed. Thus plotted, the result was not only intelligible, 

 but — what was far more important — it actually represented what 

 was seen in the record of the tree. 



3. There still remained Zones I and II. By this time it had 

 been ascertained that the leaf-pattern of the first is 5-ranked, and 

 that it lasts but a very short time before passing into the transition 

 of Zone II. So a narrow zone of that pattern was plotted at a 

 suitable distance below Zone III, and the transition was accom- 

 plished precisely as it was in Zone IV above — by bringing down 

 the 5-ranked secondaries of III on a curve which finally merged 

 them in the verticals of Zone I. Leaf-stations were then plotted 

 throughout these two areas, and permanent numbering was estab- 

 lished throughout the Chart. 



4. The reader of course will not imagine that the broad open 



* See in Plate I the descending curve between \os. 190 and 112, and in 

 Plate II between Nos. 148 and 96. 



