PART SECOND. 



PHYSIOLOGICAL BOTANY. 



CHAPTER I. 



OF THE VEGETABLE CELL. 



368. At the head of this chapter we place a sketch represent- 

 ing a thin cutting from the rhizome of Bloodroot, as seen under 

 the microscope, magnified 100 diameters. It is all made up of 

 cells, of various forms and 



colors, some green and red 

 translucent, and others 

 purely transparent. The 

 microscope reveals a sim- 

 ilar structure in all plants. 

 In the pith of Elder, pulp 

 of Snowberry, and espe- 

 cially in the pulp of 

 Orange, we can discern 

 the cells with the naked 

 eye. Therefore 



369. The cell is the el- 

 ementary organism which 

 by its repetitions makes 



,i f 11 465. Section of the rhizome of Bloodroot; a, a, a bundle of 



lip the maSS OI all VegCta- wood-cells. The shaded cells contain the color a, green, 



tion. It is defined as a 



closed sac composed of membrane containing a fluid. 



370. The primary form of the cell is spheroidal. In some 

 cases it retains this form during its existence, but generally, in 



