MICROSCOPIC STRUCTURE OF VEGETABLE IVORY. 



{Phytelephas macrocarpa. ) 



y Fio. 



Fig. 1.— Radial section of testa and endosperm. X 120. 



A. Outside layer of seed coat composed of thin-walled parencliyiua. 



B. Columnar sclerencliyinatous cells. 



C. Tliin layer of yellow tissue, apparently liojiiogeneous. 

 I). Thin layer of kidney shaped indurated cells. 



E. Broad band of fibrous layers much warped and intcrcroswd. 



(Rupture between testa and endosperm occurs in middU; of [■;. 



F. Endosperm. 



Fig. 2. — Hexagonal cones from columnar celLs. (Fig. 1 B.) \ li^O. 

 Fig. 3. —Transverse section of columnar cells. (Fig. 1 B.) X 1(30. 

 Fio. 4. — Tangential section of endosperm. (Fig. 1 F.) X li>0. 



Frma a drawing by Mr William Coats. 



' i A £. Jtfhnstnn Kdinturgh , and London 



