THE VENATION OF THE SPECIES OF SALIX. 49 



very convenient, and no other more suitable substitutes 



could be thought of. 



I desire here to make general acknowledgment of my 

 great obligation to all my correspondents who so kindly 

 forwarded to me, at request, the fresh material needed for 

 my work. Credit is given to each one respectively in the 



synopsis. 



Glossary. 



Primaries and secondaries, as generally used. 



Tertiaries, the veinlets next after secondaries, used in sub- 

 dividing. 



Costals, the short or incomplete primaries. 



Terminals, the delicate veining within the final meshes. 



Comb-like terminals, clusters of straight terminals along 



midrib impinging at right angles to it; examples, Nos. 

 9, 11, 15. 



Marginal line, a straight continuous vein along the margin ; 



examples, Nos. 6, 21, 22. 



Crenated, as generally used. 



Looping, a primary bending at the border until it meets 



the next above it; example, No. 13. 



Arching, the contiguous arms of two dividing primaries 



uniting; ex. No. 15. 



Vanishing, as when terminals fade gradually until imper- 

 ceptible. 



Stellate points, seen in the center of meshes after obliter- 

 ation of terminals; ex. No. 7. 



Regular, when the veins run parallel, whether straight or 



curved; ex. No. 1. 



Irregular, when parallelism is mostly absent. 



Even, of unvarying caliber; ex. No. 3. 



Uneven, the opposite of even; ex. No. 16. 



Smooth, having clearly defined, even edges; ex. No. 3. 



Blocky, when the meshes are mostly four-sided, squarish 



or oblong; ex. No. 8. 



Polygonal, when the meshes are not blocky, but rounded, 



few to manv-sided; ex. No. 16. 



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