ADVERTISEMENTS. 



T. HOSS, 



(SON AND SUCCESSOR OF THE LATE ANDREW ROSS,) 



OPTICIAN, 



^^os. 2 and 3, FEATHERSTONE BUILDINGS, HIGH HOLBOUN, 



LONDON, W.C, 



HAS NOW IX STOCK, EEADT FOR DELIVERY, A CHOICE COILECTIOX OE 



• WITH ALL THE ACCESSORY APPARATUS. 



THE ACHROMATIC OBJECTIVES, 



Ranging from 3 inches to ^V inch, have great separating power, and give perfect definition By improvements recently 

 pSd by T. Ross, the higher po^ver3 are now constructed to work through -01 glass {-.ho ot an inch in thickness). 



COMPOUND ACHEOMATIC MICEOSCOPES, 



With Object-glass, Eye-piece, and Apparatus, from £10. 



mti\an\lt |0tttail, 'gu)i$ti\p, mtlim^t, an^ Stcmscopit f n\sf5, laments, 



Yoh v. p. 74 ; Times, Jan. 10, 1839 ; and Athenctum, Jan. lo, l«o9. 



Naval MUitary, and Tourists' Telescopes; Field, Race, and Opexa Glasses ; Hand and Pocket 

 M^gn^fier!! S SUver, and Steel Spectacles, Eye-glasses, etc., etc., always in stock, or made 

 to o^dei. 



.. Mr THOMAS UOSS Im. also cffccM a conBulomtlo increase in lie 'P^fY'l?/,''"' !r»?o™ml \ol cffi "»ltU 

 UmJf ot the advanlagc. to bo oWained from tl,o ™riou^,aa Hues ot sl- w^^^^^^^ Til a S 'pR^Sra'pi* 



Microscopical Society c.f London, President's Address. See Qmrferly Jota ml, ^ ol, ^ . p. 1 1- 



T. ROSS M.I., Ud .p.ards of 2' years cperlence fUJ. M. ^f^^-^^^^.^^^Z::^ "'"'"'"' ''""^"'"" 

 of Optical Jnslmmenls is/all^, prepared io maintain the high repvtatton of this Lstahlisfiment, 



Countrn mb .foreign Orbtr.. promi^iln tnM, unb bulo forfonrb.b mr nm^\ of u r.mUiuute pn.nble 

 ^' in f onbon. 



CATALOGUES MAY BE HAD ON APPLICATION. 



