DESCRIPTION OF PLATES. 



Plate I. (Frontispiece.] Old trees of the white mulberry (Morns alba) 

 in the grounds of the United States Department of Agriculture. 



Plate II. Branch of the white mulberry {Morus alba), with large undivided 

 leaves of thick texture and smooth surface. The leaves of this variety 

 are preeminently adapted for silkworm food. 



Plate III. Branch of the white mulberry {Morns alba), with divided leaves. 

 Seedlings from the same parent will sometimes have leaves of the divided 

 form, others assuming the undivided shape shown in Plate II. while some 

 may have both forms on the same tree. 



Plate IV. Branch of a seedling Russian mulberry i Morus all/a), variety 

 tatarica. This mulberry, owing to its extreme hardiness, is used for stocks 

 on which to graft or bud the most valuable varieties in order to perpetuate 

 their characteristics, propagation from seed being altogether unreliable for 



perpetuating varieties. 



Plate V. Summer cuttings of the white mulberry {Morus alba'), with leaves 

 shortened to prevent excessive evaporation while rooting. 



Plate VI. Branch of the white mulberry {Morus alba), variety venosa. This 

 is an ornamental variety and is of no value as food for silkworms. 



Plate VII. The Osage orange and the paper mulberry. Fig. 1. — Leaves, fruit, 

 and bark of the Osage orange {Toxylon pomiferum) . Fig. 2. — The paper 

 mulberry {Broussonetia papyrifera). A. leaf from old tree: B. leaf from 



2-year-old seedling: C. twig with female flowers. This variety is without 

 value as food for silkworms. 

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