Animal and Vegetable Fibre. 319 



sophical Transactions, it appears — 1. That fibre has its 

 origin in the so-called " cytoblast," the outer part of which 

 always passes into a ring or coil of fibre ; 2. That when a cell 

 is to arise, its primary membrane is formed out of this ring 

 or coil of fibre ; 3. That then the nucleolus of the " cytoblast" 

 becomes the nucleus of the cell ; 4. That the outer part of the 

 nucleus of the cell also passes into a ring or coil of fibre, 

 wherewith to form deposits such as the annular and spiral, 

 or to weave the secondary membranes ; 5. That the term 

 " cytoblast " is unsuitable, as the body so called does not al- 

 ways become a cell ; 6. That fibre is thus more universal as 

 well as more primitive even than the cell, for fibre not only 

 forms the cell, but it forms other structures without having 

 first to form a cell ; 7. That the prime mover in both the 

 " cytoblast " and the nucleus is the nucleolus, which is the 

 organ of absorption, assimilation, and secretion ; 8. That the 

 nucleolus is continually giving off its substance and continu- 

 ally renewing it, continually passing from the state of nucle- 

 olus into that of " cytoblast " or nucleus, — so that the " cyto- 

 blast " and the nucleus are each of them but the nucleolus 

 enlarged ; 9. That it is therefore the nucleolus enlarged that 

 passes into fibre ; 10. That the nucleolus always passes into 

 fibre, and directly into no other form than that of fibre ; 11. 

 That thus the whole organism arises out of nucleoli, for fibre 

 is but the nucleolus in another shape, and every structure 

 arises out of fibre ; 12. That the nucleolus is reproduced by 

 self-division, and that subsequently, when it has passed into 

 the form of fibre, the mode in which the nucleolus gives origin 

 to other structures is such as to imply even here the con- 

 tinued reproduction of its own substance — that mode being 

 self-division. 



Primary Membrane of the Cell, its mode of Origin — Secondary 

 Membranes of the Cell, their mode of Origin — Division of the 

 Cell. 



With the exception of some from cartilage, there are no 

 drawings in my paper " On Fibre " of 1842 that contribute so 

 largely towards the solution of these three questions; as those 



