8B0BETI0N RESERVOIRS. 



131 



but slightly different developments of the same organ (Pig. 

 117). 



(a) The smaller and more irregular intercellular spaces may be 

 studied in the lundamental tissue of the stem of Indian corn, in tlie 

 parenchyma of most leaves, and the stems of Juneus. 



Pi». 116. 



Fig. 117. 



Fipr. 116. — Internal glands of the leaf of Dieiamnus fraxitieUa. A and B, early 

 stapes of development ; C, mature gland ; d. epidermis ; c, ;), mother-cells of the ue- 

 creting cells; o, drop of ethereal oil. — After Ranter. 



Fig. 117.— Glandular hair of the inflorescence of Die'ammia fraxinella ; A and B, 

 earliest stages, showing the origin to be similar to that of the internal glands ; C, fully 

 developed hair ; the part A is the true hair, while all below it, including the oil cav- 

 ity, is to be regarded as an outgrowth of the sub-epidermal cells. X aboiit 220.— After 

 Bauter. 



(6) Thin cross-sections of the stems and petioles of Nymphma, 

 Nuphar, Nelumhium, Sagittaria, Potamogeton, and many other water 

 plants, afford excellent specimens for the study of intercellular c.inals. 



