Monthly M ical 
DoT Neh CORRESPONDENCE. 113 
Fig. 1 shows the stage itself with a live box (which can be used 
with the spot lens) placed in the centre; and by rotating the milled 
disk shown at the edge, the object can be viewed at every angle of 
light. Fig. 2 is the mounted object-holder for transparent or opaque 
slides, and fits into Fig. 1. Fig. 3 is a cork disk for pinning on any 
object that may be wished to be seen in various positions. 
CORRESPONDENCE. 
Tur Derrmition or Nosert’s Linus. 
To the Editor of the * Monthly Microscopical Journal. 
Wasuineton, D.C., June 18, 1870. 
Dear Str,—The May number of the Journal contains on page 257 
et seq. a letter from Mr. Charles Stodder, of Boston, in which that 
gentleman reasserts the claim made in his paper published in the 
‘ American Naturalist’ of April, 1868, that he and Mr. Greenleaf had 
resolved the 19th band of the Nobert’s plate with an immersion }th, 
made by Mr. Tolles, of the Boston Optical Works, and alludes to me 
in a manner which seems to require some reply. His letter is followed, 
in the same number, by one from Mr. R. C. Greenleaf, in which that 
gentleman states his agreement with Mr. Stodder’s opinions, and talks 
about “the honor of our American instruments.” ; 
Mr. Stodder writes with a warmth which will be best understood | 
when it is known that he is the treasurer and agent of the Boston 
Optical Works, the establishment at which Mr. Tolles produces his 
really very excellent lenses, and that he has for some time claimed 
