126 PRACTICAL BOTANY. 



lorus fcetidus, which was just ready to open, taking 

 care that the anthers shall be cut through transversely. 

 Neglecting the other parts, mount the sections of the 

 anthers in glycerine, and examine with a low power. 

 Note 



1. The general outline of the section, and compare 

 it with the form of the bi-lobed anther, as above 

 observed. 



2. The two large cavities one in each lobe. 



3. The partial Septa, which originally divided each 

 cavity into two Pollen-sacs or Microsporangia ; the 

 anther has thus orginally four pollen-sacs, and these 

 may sometimes be found still distinct even in almost 

 mature anthers (cf. development of anther). 



4. A single small Vascular bundle lying sym- 

 metrically between the cavities, in the central part 

 (or Connective) of the anther. 



5. Pollen-grains or Microspores, mostly to be 

 found lying free in the glycerine. 



Put on a high power, and observe that 



1. The wall of the anther is composed of 



(a) An external Epidermis with a well-marked 

 cuticle. Within this 



(fr) A ]ayer of cells with a fibrous thickening of the 

 walls. 



(c) Immediately within (6) a narrow ill-defined band, 

 consisting of the remnants of a transitory layer of cells, 

 the Tapetum. 



2. A point in the wall of each cavity, opposite 

 the partial septum, where the cells are smaller, and the 

 inner layer not spirally thickened ; this is the point of 

 dehiscence of the anther. 



