Mr. Lindley on Vegetable Tissue. 267 



formed by the development of a spiral fibre within a 

 membrane. 



This being the case, there seems to be no doubt that the 

 basis of cellular tissue is both membrane and fibre, and that 

 the character hitherto assigned to it will require to be much 

 modified in consequence. It may possibly become more diffi- 

 cult to define the exact difference between cellular and vascu- 

 lar tissue : but it will be much less difficult to understand the 

 origin of the latter; and a knowledge of the real character of 

 the former will explain the presence of such tissue as the 

 Elateres of Jungermannia among cellular plants, without the 

 necessity of supposing the existence in them of partial ten- 

 dency to vascularity. 



(To be continued,} 



ON HARRIOT'S PAPERS. By S. P. RIGAUD, M.A. F.R.S. 

 Savil. Prof, of Astronomy. 



[To the Editors of the Journal of the Royal Institution.] 



Gentlemen, Oxford, Sept. 1, 1831. 



A LLOW me to request that you would correct a mistate- 

 ment which appears in the third Number of your 

 Journal. Neither you, nor the author of it, could have been 

 aware of the injustice of the accusation which it conveys, or 

 I am confident that I should not have occasion to make this 

 appeal to you. 



In a very curious dissertation on the first invention of teles- 

 copes, Dr. Mohl takes occasion to say (page 495 of your first 

 volume), * it is to be lamented that Harriot's papers and manu- 

 scripts are at present buried in one of the libraries of the 

 University of Oxford.' Now the truth is, that these papers 

 and manuscripts are not, and, what is more, never were in any 

 of our libraries. The story is old ; but as it appears that an 

 erroneous impression respecting it still exists, it may yet be 

 right to lay the real state of the case before the public. 



Harriot lived under the immediate patronage of Henry Earl 

 of Northumberland, from whose daughter the present Earl of 

 Egremont is descended, and from whom he inherited these 



