1879. | Microscopy. 797 
examine and ne at leisure, and with the quiet and comfort of 
a private residen e will continue to supply his own lenses, 
unless other mace are x referred. 
Ernst GunpLacH.—This well-known optician announces 
another business eine by which he will devote his time ex 
clusively to manufacturing, and L. R. Sexton, of Rochester N. Y, 
will attend exclusively to the a of business correspond- 
ence, selling goods, etc. He clai o have recently made great 
improvem ments in objectives and oculars, and t o have invented an 
second composed of two triplets, and ranging from a 2 inch of 
24 Era requiring a microscope body with internal screw one 
inch wide, to a 14 inch of 36 degrees ; these triplets can be sepa- 
rated, Se half of the same powers. Class C, aplanatic object- 
ives, three system lenses, the front being a triplet, having large 
at field, and chemical and visual foci nearly together, specially 
aes i Ment aoe and greng from a I inch o egrees 
nch of 80 degre Class D, resolvin as 
A varying from a % inch of 100 degrees, requiring 
ernal screw of one inch to a % in 130 degrees, and 
the latter from a inch of 115 degrees water angle, to a I- 
inch es water le. cedar oil immer 
sions, four systems, with long working focus and high resolv- 
ing qualities, varying A O degrees water 
ang ž requiring an internal screw of 1 inch, toa 1-25 inch o 
150 degrees water angle. Mr. Gundlach introduced at the meet- 
ing of the Rochester Microscopical Society, on the 13th of Oc- 
tober, last, a “ globe lens, o o) 
lass, made in ha S, SE a solid sphere of Crown 
correc 
ens is t 
obtained, having long working focus in 1 addition to the well-known 
advantages of the ea form, As yet they have only been 
made as pocket magnifiers, 
