CELLULAR TISSUE. 23 
some of oxalate of lime. They have been observed in the 
juice of the Hyacinth, the Euphorbiacez, some species of 
Cactus and Rhubarb, the Mirabilis jalapa, and many other 
plants. 
56. The cellular tissue, seems, from the observations of 
Mirbel, to be formed by the power of each cell in developing 
new ones, so that they are more or less connected with each 
other, and may all be the product of one primitive vesicle. 
_ The new cellules are in some cases developed with truly won- 
_ derful rapidity, From a statement given by Junghuns, that 
he has seen the mushroon Bovista giganteum grow in a sin- 
gle night from a mere point, to the size of a large gourd, Dr. 
Lindley calculates that “ its bladders must have developed at 
the rate of near 4,000,000,000 per hour, or of more than 
sixty-six millions in a minute.” 
57. The membranous cellular tissue is found in all vege-— 
table, forming a very considerable part of their substance ; 
_ gi), lichens, which are composed of it alone. =e 
58. In the flowering (Phenogamic), or Sotyledokious plants, 
it is conjoined with woody tissue, and vascular tissue. The 
central portion or pith (medulla), of dicotyledonous trees, 
the medullary rays, which extend transversely from the pith 
to the bark, and the matter occupying the space between the 
veins of the leaves, are formed of the cellular tissue. And 
it is found compressed and elongated in the wood and bark, — 
_ of vascular tissue. 
59, According to De Candolle, the cells perform in the 
economy of the plant, the important part of conveying the 
sap upwards, being possessed of an organic ——s by eee 
masa weed effect its ascent. — : 
_ and there are many, as sea-weeds (algae), mushrooms _ te ? 
_ forming longitudinally, cylindrical layers between each layer 
