262 Trans. Acad. Sci. of St. Louis. 



hg; spongy parenchyma surrounding the tracheid island except the two 

 rows of thin-walled cells which form a sheath about the island. — lb, an 

 oblique section, showing a general view of the micropyle, radicle, tracheid 

 Island, and arillate processes. — Ic, shows a portion of the funiculus, the 

 arillate processes, hilum, and collapsed parenchyma. — Id, asparagin crys- 

 tals in cells of cotyledons.^ II, Phaseoltis vulgaris: crystals in osteosclerid 

 layer; epidermal cells of the embryo contain no starch. 



Plate XXVIII. — I, Lathyrus odoratus: Malpighian cells irregular on the 

 surface; nucellus compressed. — lb, portion of an isolated Malpighian cell 

 in hilar region. — II, Lathyrus latifolius. — III, Lathyrus sylvestris. — IV, 

 Petalostemon candidus: cotyledons, superior face with palisade cells. — IVb, 

 Inferior face of cotyledons. — IVc, endosperm. — V, Lathyrus sylvestris: 

 spongy parenchyma of hilar region, showing peculiar cellulose thickenings 

 of walls. 



Plate XXIX. — I, Tephrosia virginiana: cross-section of cotyledon show- 

 ing position of the lysigenetic canals. — lb, the lysigenetic canal after treat- 

 ment with chlor-iodide of zinc. — Ic, cross-section through cotyledon, 

 superior face, after treatment with sulphuric acid and iodine. — le, different 

 view of reservoir. — If, Ig, Tephrosia leucantha: lysigenetic canal. — II, 

 Cicer arietinum. — lib, embryo with starch grains. — lie, Malpighian cells 

 more magnified. 



Plate XXX. — I, Pisitm sativum: nutrient layer divided into two parts, 

 epidermal cells of cotyledons much smaller than the starch cells. — II, 

 Acacia filicina : cells of nutrient layer thick-walled; nucellus compressed. — 

 lib, two adjacent cotyledons of superior face showing palisade cells. — III, 

 Desmodium DiUenii: inferior face of cotyledon; small epidermal cells and 

 parenchyma below. — Illb, two rows of palisade cells, upper face of the 

 cotyledon; aleurone grains ia cells. 



Plate XXXI. — I, Sterculia heterophylla: Malpighian cells with two 

 light lines; below the light lines a darker zone; above the Malpi- 

 ghian cells outer dark-brown cells of testa. — II, Marsilia quadrifolia: 

 cross-section through the wall of sporangium; light line in middle 

 of cell. — III, Zizyphus vulgaris: surface view of Malpighian cells 

 shown at ms; minute canals from peripheral walls. — IV, Sicyos angulata: 

 light line near the cuticle; cell-cavity with branched canals. — V, 

 Ipomoea tuba: light line in upper part; cell-cavity very small; a row of 

 small cells above the Malpighian layer, which act as a support for the 

 hairs of the seed; an entire cell shown to the right. — VI, Dracocephalum 

 parviflorum: epidermal cells; the Malpighian layer below with two light 

 lines; several chromatophores in the cell-cavity; the cells of the nutrient 

 layer are abundantly supplied with tannin. 



Plate XXXII. — I, Canna indica: Malpighian cells with light line in 

 middle. — II, Geranium carolinianum: small epidermal cells above the Mal- 

 pighian layer; these cells with crystals. — III, Gossypium herbaceum: walls 

 of Malpighian cells greatly thickened in lower part; cell-cavity only occurs 

 in the upper one-third of the cell; two light lines. — IV, Tilia pubescens: 

 light line in upper part of Malpighian cell. — V, Malvastrum angustatum: 

 the epidermal cells, the supporting layer and Malpighian layer. — VI, 

 Nelumbo lutea: Malpighian cell. — VII, Adolphia californica: light line 

 in upper part of Malpighian cell. — VIII, Ceanothus americanus: the Mal- 

 pighian cells followed by the nutrient layer. — Vlllb, surface view of 



