10 STRONG DRINK AN I) TOBACCO SMOKE. 



illustration of the composition of the soft, juicy parts of 

 most plants, that is to say, cellular tissues, and the 

 illustration will further show the vacant or intercellular 

 spaces, where the cell- walls do not infringe upon each 

 other. AVhen such a section as that included between 

 the upper surface and the line a, fig. 3, is placed under 

 the microscope (supposing it to be sufficiently thin and 

 transparent to transmit light), it is evident that the 

 side walls of five of the cells will be visible, and the 

 ends only of two. 



But many plant cells possess the singular property of 

 forming on the inner surface of their walls a deposit, 

 which takes sometimes very eccentric and very beautiful 

 forms. Of these the most simple is that of a ring or 

 rings, as in the cells found in many of the Cacti, one of 

 which is represented at fig. 4, in which two such rings 

 occur, serving probably to give it strength. Fig. 5 is 

 another cell, with as many as- six distinct rings visible 

 on the inner surface of its wall. This deposit very 

 frequently overlies almost the entire surface of the cell, 

 leavino:, where it is absent, minute dots which admit the 

 light readily through them. Fig. 6 represents a row of 

 such cells, which are also very abundant in elder pith, 

 but possess fewer markings or dots. 



Any or all these forms of cells, when collected 

 together, as shown at fig. 3, form what is called, tech- 

 nically, a cellular tissue, as distinguishing it from 

 another tissue common among plants and abundant in 

 wood, which I will now describe. 



