ILLUSTRATIONS. 



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PLATE T. Fig. 1 . Seed coat of charlock. Fig. 2. Cross cells of seed coat of rye. 

 Fig. 3. Cross cells of seed coat of wheat. Fig. 4. Aleuron layer 

 of wheat. Fig. 5. Epidermal layer of seed coat of common pig- 

 weed., Fig. 6. Epidermal layer of seed coat of rough pigweed. 86 

 II. Fig. 1. Epidermal layer of seed coat of cottonseed. Fig. 2. Pali- 

 sade layer of seed coat of cottonseed. Fig. 3. Perisperm layer 

 of seed coat of cottonseed. Fig. 4. Seed coat of wild bergamot. 

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

 6. Pigment cells of flaxseed 86 



III. Fig. 1. Epidermal layer of sorrel seed. Fig. 2. Epidermal layer of 



glume of yellow foxtail. Fig. 3. Hemin crystals. Fig. 4. 

 Fragment of bone showing lacunae 86 



IV. Fig. 1. Epidermal layer of seed coat of cow herb. Fig. 2. Beaded 



Us near hilum of seed of cow herb. Fig. 3. Epidermal cells 

 of corn cockle. Fig. 4. Epidermal cells of Jimson weed seed. 

 Fig. 5. Epidermal cells of seeds of Bouncing Bet. Fig. 6. 



Epidermal cells of seed of night-blooming catchfly S6 



V. Transverse sections of seeds of species of genus Plantago a 86 



VI. Fig. 1 Slime cells frorn seed of Plantago aristata Michx. Fig.^2. , 

 Endosperm cells of seed of P. aristata Michx. Fig. 3. Epider- 

 mal layer of seed of P. major L. Fig. 4. Epidermal layer of 

 seed of P. rugelii Decaisne.a Fig. 5. Epidermal layer of seed 

 coat of smartweed. Fig. 6. Seed eoat of curled dock 86 



On Plates V and VI the name Decaisne is by mistake printed " Ducaisne." 

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