vi PREFACE. 



may be said to date from the year 1854, has brought 

 about so many alterations both in the form and in the 

 spirit of the regulations, that older members of the 

 University have been known to speak of the place 

 as so changed that they could scarcely recognise it. 

 Hence, in respect of this article, I have availed myself 

 of the liberty granted by Professor Helmholtz, and 

 have altogether omitted some passages, and have- 

 slightly modified others, which would convey an erro- 

 neous impression of the present state of things. I 

 have also on these points consulted members of the 

 University on whose judgment I think I can rely. 



In other articles, where the matter is of prime 

 importance, I have been anxious faithfully to repro- 

 duce the original ; nor have I in any such cases al- 

 lowed a regard for form to interfere with the plain 

 duty of exactly rendering the author's meaning. 



E. ATKINSON. 



PeRTEBERY HlLL, CA.MBEELEY : 



Dec. 1830. 



