INDEX TO PLATES. 



PLATE I. 



Fi<;. 1. Surface view of seed coat of charlock (Brassica arvensis (L.) B. S. P.)- X150. 



2. Surface view of cross cells of seed coat of rye. X150. 



3. Surface view of cross cells of seed coat of wheat. X150. 



4. Surface view of aleuron layer of wheat. X 150. 



5. Surface view of epidermal layer of seed coat of common pigweed ( Chenopodium 



sp.). X150. 



6. Surface view of epidermal layer of seed coat of rough pigweed (Amaranthus 



sp.). X150. 



PLATE II. 



FIG. 1. Surface view of seed of cottonseed epidermal layer. X75. 



2. Surface view of seed coat of cottonseed layer of palisade cells. X?5. 



3. Surface view of seed coat of cottonseed perisperm layer. X150. 



4. Surface view of seed coat of wild bergamot ( Monarda fistulosa L.). X150. 



5. Sclerenchymatous cells from seed coat of flaxseed. X150. 



6. Pigment cells of flaxseed. X150. 



PLATE m. 



FIG. 1. Epidermal layer of sorrel seed (Rumex acetosella L.). X150. 



2. Epidermal layer of glume of yellow foxtail (Chaetochloa viridis (L.) Scribn.). 



X150. 



3. Hemin crystals. X600. 



4. Fragment of bone showing lacunae. X125. 



PLATE IV. 



FIG. 1. Epidermal layer of seed of cow herb ( Vaccaria vaccaria L.). X150. 



2. Beaded cells near hilum, seed of cow-herb. X300. 



3. Surface view of epidermal cellsof corn cockle (Agrostemma githagoL.). X75. 



4. Surface view of epidermal cells of jimson weed seed (Datura stramonium L.). 



X75. 



5. Cells of epidermal layer of seeds of Bouncing Bet (Saponaria ojjidnalis L.). 



X150. 



6. Cells of epidermal layer of seed of night-blooming catchfly (Silene noctiflora 



L.). X150. 



PLATE V. 



Transverse sections of seeds of species of genus Plantago. X50. 

 Fig. I. Plantago major L. 



2. P. rugelii Decaisne. 



3. P. lanceolata L. >. 



4. P. aristata Michx. 



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