14 



BULLETIN 223, TJ. S. DEPARTMENT OP AGRICULTURE. 



The heading provides for entering the tree to be studied, locality, 

 garden, row and tree numbers, and date, below which the sheet is 

 ruled hi horizontal lines for noting the angles of the different classes 

 of pinnae: A (antrorse), / (introrse), R (retrorse). Above the lines, 

 ax indicates that the axial divergences of the pinnae — that is, the 

 angles by which they diverge to the right or left from the rachis — are 

 to be recorded. 



Below the lines, p indicates the angles of divergence from the plane 

 that would be formed by a perfectly flat blade. Below these a line 

 provides for the record of the "Length of pinnae " above the line and the 

 corresponding breadths below, the breadth being noted at the broad- 

 est part, the pinnae blade being unfolded and spread flat. 



Form A. — Date variety, , S. P. I. No , row . . , tree .., garden. 



[Notes taken , 191 . . . Angles of pinnae with planes of rachis. Distance in feet from base of blade.] 



Antrorse, ax 



] 



I 



! 



! 



1 



5 



3 



7 



8 



9 10 11 12 



p 



Introrse, ax 





























p 



Retrorse, ax 





























p 



Length of 

 pinnae 





























Breadth " 





























Groups . 



Remarks . 



The vertical ruling in form A provides spaces for entries for each 

 foot of blade length from below the first spines to the apex. 



For some leaves exceeding a length of 12 feet, the record has to be 

 carried to the ruled spaces below. 



The length of the spine area and the total blade length are indi- 

 cated at the same time. An average leaf being selected, it is thought 

 that one or two characteristic readings to each foot of length from base 

 to apex, usually along one side of the blade only, will record the 

 characters effectively, and that two or three leaves each from as 

 many trees will indicate the leaf characters of a given variety. For 

 varieties of paramount importance, such as Deglet Noor, Thoory, 

 Hayany, and a few more, of course a greater number of records are 

 desirable. 



