238 CORRESPONDENCE. 



right and left forefingers acting together, a wonderful certainty is 

 felt that is very pleasant, even when using the immersion ^^fth. And 

 if the covering glass be too thick to focus through, this is found out 

 at once. I may add that tliis method answers best when the micro- 

 scope is considerably inclined. 



Yours truly, 



John Newton. 



Assistance to Microscopists by Mr. Wenham. 



To the Editor of the ' Monthly Microscopical Jounal.^ 



New York, U.S.A., Sept. 24, 1873. 



Sin, — I desire, through your valuable Journal, to express my thanks 

 to Mr. Wenham for the assistance so kindly given to microscopists in 

 its pages. An amateur of humble pretensions, and no long experience 

 in microscopic work, I have derived the greatest advantage from 

 his instructions. I have recently finished a ith objective upon his 

 formula, without which I should never have thought of attempting 

 anything so difiicult ; and the result, due to no merit on my part but 

 that of closely and carefully following Mr. Wenham's directions, is so 

 good as to have greatly surjprised my microscopic friends, and to repay 

 me well for my labour. And when the fact is taken into consideration, 

 that this is the first and only objective I have ever even tried to make, 

 the value to an amateur of Mr. Wenham's instructions is sufi&ciently 

 evident. 



I trust I have said enough to prove to Mr. Wenham how well his 

 articles in the Monthly are appreciated in America. Perhaps he will 

 permit me to suggest to his consideration, that many of the amateurs 

 here have not much money to spend upon their favourite study, and 

 that in this country the price of objectives is very high. The powers 

 above the ^th are difiicult of execution and of limited use; but 

 formulas for one or more of the lower powers would be gladly received. 

 And I should also like much to know how to make an immersion front 

 to my J th. 



In saying this I hope that Mr. Wenham will not be reminded of 

 the famous definition of gratitude ; but will believe in the sincerity of 

 our thanks for what he has done for us, even if he, from any reason, 

 declines to do any more. y^ 



In Ke Mr. Wenham v. Dr. Pigott. 



To the Editor of the ^Monthly Microscopical Journal' 



London, Sept. 16, 1873. 

 Sir, — The last effusion of Mr. Wenham, as a Vice-President of the 

 Royal Microscopical Society, is one which excites a good deal of atten- 

 tion. It is quite unnecessary to say that it is either unfair or insulting. 

 But a few temperate remarks may not now be unacceptable. We have 

 seen a controversy about the angle of certain glasses extend over a 



