a 
a 
On the Aperture of Object Glasses. 105 
Ars. XIV.—Remarks on Mr. Wenham’s paper on Aperture of 
Object Glasses ; by Professor J. W. Batey. 
As Mr. Wenham now frankly admits the correctness of my 
‘Statements with regard to the possibility of resolving difficult 
test-objects even when balsam-mounted, no further remarks are 
mecessary upon that point, but a few words of comment are re- 
quired by other portions of his paper. 
That my reply was written before I could have had any 
knowledge that Mr. Wenham had recalled his remarks in which 
doubt appeared to be thrown on my positive statement of facts 
will sufficiently appear by the date of my reply, which was pub- 
lished in the American Journal of Science for January, 1855, the 
very time in which Mr. Wenham’s retraction of his remarks ap- 
: peared in he Quarterly Journal for Microscopic Science 
t eae 
If Mr. Wenham finds anything objectionable in the form of 
my reply, he should bear in mind that this discussion is not one 
of my seeking, and that I put the best possible constrnetion upon 
his remarks which seemed to call in question the correctness of 
it, which is indeed “contrary to all reason.” 
Mr. Wenham so. 
out of the balsam, instead of indo it, and it will then be seep that 
4 
