14 ORGANOGRAPHY. BOOK I. 



7. Fibres very sliort, attached to the sides of cells of various 

 figures, to which they give a sort of toothed appearance, as in 

 the anther of Phlomis fruticosa and other Labiatae. (Plate I. 

 fig. 15.) 



The last three were first noticed by Purkinje. 



8. The fibre twisted spirally, in the open membranous 

 tubes that form the elaters of Jungermannia, apparently 

 constitutes another form of tissue of this order. (Plate I. 

 fig. 17.) 



B. Fibre witliout Membrane* 



9. Spiral fibi'es repressed by mucus, but having sufficient 

 elasticity to uncoil when the mucus is dissolved, and then 

 breaking up into rings. (Plate I. fig. 16.) These are what 

 are fo\md in the seed-coat of Collomia linearis. Tliey approach 

 spiral vessels so very nearly, that when I originally discovered 

 them I mistook them for such. They are known by their 

 roundish or depressed figure when at rest, and by the want 

 of an inclosing membrane, and by their brittleness when un- 

 coiled. 



10. Fibres short, straight, and radiating, so as to form little 

 starlike appearances, found in the lining of the anthers of 

 Polygala Chamaebuxus, &:c. by Purkinje. (Plate I. fig. 19.) 



11. Fibres originating in a circle, curving upwards into a 

 sort of dome, and uniting at the summit, observed by the 

 same anatomist in the anthers of Veronica perfoliata, &c. 



1*2. Fibres standing in rows, each distinct from its neigh- 

 bour, and having its point hooked, so that the whole has some 



* It is not improbable that this form was in the beginning of its growth 

 composed of membrane. Mirbel has indeed shown that the curious cells 

 whicli line the anther of the common gourd are continuous membranes till 

 just before the expansion of the flower, when they very suddenly enlarge, 

 and their sides divide into narrow ribands or threads, curved in almost 

 elliptical rings which adhere to the shell of the anther by one end ; these 

 rings are placed parallel with each other in each cell, to which they give an 

 appearance like that of a little gallery with two rows of pilasters, the 

 connecting arches of which remain after the destruction of the roof and 

 walls. 



