DR. MARTIN BARRY ON FIBRE. 133 



nearly facing one another. Around the orifice were pale discs not 

 yet arranged into a filament (see par. 18). 



Fig. 135. Nuclei of two other cells. One centre is seen in the nucleus a, sur- 

 rounded by filaments. This centre has its orifice. The nucleus /3 

 presents several parts, appearing as though held together by inter- 

 lacing filaments. Yet perhaps this division of the nucleus into 

 several parts denotes incipient division of the cell into as many 

 minuter cells, of which each part of the divided nucleus would have 

 been the nucleus. See pars. 18, 19. 



Fig. 136. Outline of two cells, the nuclei of which had escaped. A filament ex- 

 tended from the situation of an unwinding nucleus to the wall of one 

 of the cells. 



Fig. 1 37. Chick in ovo ; incubated fifteen days. Outline of cells in the cartilage of one 

 of the phalanges (the terminal one). Filaments indistinctly seen at a. In 

 the nuclei filaments were not seen (as in figs. 133 to 136) ; yet the discs 

 of which the nuclei were composed (ft), appeared like rings : and the cen- 

 tral portion of the nucleus y consisted of two halves as in fig. 134. 

 Fig. 138. Chick in ovo ; incubated fifteen days. Filament observed in cartilage of a 



bone of the leg, more advanced than that in fig. 137. 

 Fig. 1 39. Outline of the hair of a Caterpillar, containing filaments, one of which is 



seen at a (par. 71). 

 Fig. 140. Sketch of part of two feather-like bodies from the wing of a Gnat. 



a, a. Structure of the filaments in these objects. 



Fig. 14 l v Sketch of feather-like bodies from the wing of a Butterfly, a. The object 

 entire, and young : '/3. part of an object of the same kind, more advanced. 

 y. Structure of the filaments in the object a. &. Structure of spirals pro- 

 ducing transverse (as well as longitudinal) striae in the object /3. 

 Fig. 142. Spider's web. Fasciculus of filaments. The filament a presents its edge at 

 the middle part. Of the other three filaments, two are on their edge, and 

 the third is on its flat surface. Citric acid. (par. 75). 



Fig. 143. Spider's web. Filament on its edge. It crossed some feather-like objects 

 from the wing of a Butterfly ; part of one of which is represented in out- 

 line in the figure. Citric acid. (par. 75). 



PLATE XI. 



Figs. 144 to 147^ are not drawn on the same scale as the rest. For the first three 

 of these, the author is indebted to a friend. Fig. 147 is taken from a drawing by 

 Dr. HESSE, in FRORIEP'S Notizen, Juli 1840, No. 309, p. 2. It represents part of 

 Dr. HESSE'S fig. 5. 



