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N a c h e t ’s P rism fo r o b liq u e l ig h t, w ith a c c u ra te re v o lv in g fi t t in g .............................................................................................. 1 1 0 R ig h t a n g le P rism fo r re fle c tin g th e l ig h t m o re p e r fe c tly t h a n th e m ir ro r , w ith a d ju s tm e n ts a n d fittin g s t o t h e t r i a n g u la r m i r r o r s tem c om p le te , a n d th e re fle c tin g su rf a c e u n c o v e re d fo r t h e c o n v e n ie n c e o f w ip in g . . . 2 10 0 P o la riz in g A p p a r a tu s , o f tw o N ic o l’s p rism s a n d o n e s e le n ite film , w ith r e v o lv in g f ittin g s to a l l ....................... ........... 2 10 0 B a r k e r ’s S e rie s o f S e le n ite s , w h ic h g iv e 13 d iffe re n t c o lo u rs a n d th e i r c om p lem e n ta ry t in ts , m o u n te d o n a n im p ro v e d p l a n fo r th e i r m o re a c c u ra te a n d e a sy a p p l i a n c e .................................................................................. ......... 3 1 0 0 B a r k e r ’s S e rie s o f S e le n ite s , a d a p t e d to t h e S e le n ite f i t t in g m e n tio n e d in “ P o la riz in g A p p a r a tu s ” 1 7 6 B u n d le o f T h in G la s s f o r p o la riz in g b y re fle c tio n o r t r a n s m is s io n .............................................................................................. 1 1 0 B la c k G la s s fo r p o l a r i z in g ........................................................................ 0 15 0 B a r k W e lls o f t h r e e siz e s , a n d h o ld e r ............................................... 0 1 2 6 APPARATUS AS APPLIED TO No. 3, No. 4 aiid No. 5 M ic ro sc o p e s . A c h rom a tic C o n d e n s e r o f tw o p ow e rs , 60 ° a n d 20® o f a p e r tu r e , ra c kw o r k a n d c om p le te a d ju s tm e n ts to h ra s sw 'o rk .. A c h rom a tic C o n d e n s e r a s a b o v e , w ith s lid in g f ittin g , a n d n o a d ju s tm e n ts to h ra s sw o rk .................................................... A c h rom a tic C o n d e n s e r , L e n s e s o f ......................................................... W e n h am ’s P a r a b o lic R e fle c to r, w ith s lid in g s to p , rackw’o rk , a n d c om p le te a d ju s tm e n ts to h ra s sw o rk .................... W e n h am ’s P a ra b o lic R e fle c to r, w ith p la in s lid in g f i t t in g s . . . N a c h e t ’s P r ism fo r o b liq u e l ig h t ......................................................... P o la r iz in g A p p a r a tu s , o f tw o N ic o l’s p rism s wdth re v o lv in g f ittin g s , a n d o n e s e le n ite f ilm .............................................. B a r k W e lls o f t h r e e siz e s , a n d h o ld e r .............................................. APPARATUS F O R M i c r o s c o p e s i n g e n e r a l . 3 0 0 2 5 0 1 10 0 3 17 6 2 10 0 0 18 0 2 10 0 0 12 6 E x t r a E y e - p ie c e fo r N o . 1 M i c r o s c o p e .............................................. 0 17 E x t r a E y e - p ie c e fo r N o . 2 , 3 , 4 , o r 5 M ic ro s c o p e ..................... 0 15 E x t r a E y e - p ie c e fo r H o s p i t a l M ic ro s c o p e ..................................... 0 13 I n d i c a to r to E y e - p ie c e .............................................................................. 0 5 M ic rom e te r , w ith J a c k s o n ’s a d ju s tin g sc rew a n d f i ttin g s to E y e - p i e c e ....................................................................... , 1 0 M i c rom e te r f o r S ta g e , d iv id e d i n to lOOths a n d lOOOths o f a n in c h , a n d m o u n te d in b r a s s .............................................. 0 10 M ic rom e te r fo r S ta g e , d iv id e d in to lO O th s a n d lOOOths o f a n in c h , u n m o u n t e d 0 5 W o lla s to n ’s C am e r a L u c id a , m t h la rg e fie ld a n d f i ttin g s to E r e c t in g G k s i S ! w i th whfofo em p lo y in g th e tw o - thW s in c h O b ie c t-g la s s a n d E y e -p ie c e s N o . 1 a n d 2 , t h e m a g n ify in g pow’c r will r a n g e fr om 5 t o 1 5 0 l in e a r ......... L a i'g e B u ll’s -e v e L e n s o n s t a n d ................... V' Sm a lle r C o n d e n s in g L e n s , w i th b a ll a n d s o c k e t f i t tm g , to a p p ly to N o . 1 o r N o . 2 M i c r o s c o p e .............................. Sm a lle r C o n d e n s in g L e n s , o n s ta n d , a n d c om p le te m o v e m e n t s ........................................................................................... y S id e S ilv e r R e fle c to r, w ith f ittin g s to lim b , o r o n a s e p a r a te s t a n d .......................................................................... .................... Am ic i’s P r i sm f o r o b liq u e l ig h t, m o u n te d o n a s t a n d . . . . . . . . . P o la r iz in g A p p a r a tu s , o f tw o N ic o l’s p rism s w ith re v o lv in g fittin g s , a n d o n e s e le n ite f ilm ....................... B a r k e r ’s S e rie s o f S e le n ite s , w ith s ta g e a n d r e v o ln n g « tm g s Tw o D o u b le Im a g e P r i sm s a n d S e lem te F ilm , w i th f i ttin g s to E y e - p ie c e a n d b r a s s p l a t e w ith h o le s . . . . . . . . . . . . . C ry s ta ls to sh ow rin g s r o u n d t h e o p tic a x is a n d f i t t e d to ^ E y e - p i e c e . . ......................................................... e a c h from ^ ir om T o u rm a lin e s ...................................................................... B ro o k e ’s D o u b le N o s e - p i e c e .................................................................... C om p r e s s o rium ..............................................V -'" ñ " n ' ' í .......................... W e n h am ’s C om p r e s s o rium fo r P a r a b o lic R e f l e c to r .................... S crew L iv e B o x .............................................................................. *.............. L a r g e p la in L iv e B o x .................................................................................... Sm a ll p la in L iv e B o x .........................................; ................. ....................... L a r v e G la s s T r o u g h , w ith w e d g e a n d s p r in g c om p le te ....... Sm a ll G la s s T ro u g h s .................................................................... “ ’om S e t o f th r e e G la s s T u b e s ................................................................iv* ' G la s s P la t e s , w ith h o llow s a n d le d g e s .................................... tto m T h r e e - p r o n g e d F o rc e p s a n d J o i n t ................................................... " L a r g e B ra s s P lie r s a n d sm a lle r d i t to ..................... 0 5 U a n d £ s. d. 1 0 0 1 0 0 1 1 0 0 18 0 0 12 0 1 1 0 2 2 0 2 10 0 2 2 0 2 2 0 0 1 0 6 1 0 0 1 1 0 0 1 0 0 0 7 0 14 0 8 6 MICROSCOPE TABLES. H a n d s om e W a ln u t-w o o d T a b le , t o re v o lv e o n c a rv e d p illa r a n d c law , w ith p la te - g la s s to p , a n d ap pm -a tu s p a c k e d in th e d raw e r s , a s s h ow n a t th e E x h ib i tio n ¿i> W a ln u t-w o o d T a b le , w ith im p ro v e d re v o h fin g f ittm g , o n h a n d s om e pillai- a n d c law , w ith l e a th e r t o p ............... » I r o n T a b le w ith r e v o h n n g to p .............................................................. MICROSCOPE LAMPS. Im p ro v e d sm a ll C am p h in e L am p , w ith g la s s c a p , to p r e v e n t ^ e v a p o ra tio n o f th e s p i r i t w h e n n o t in u s e .................... ~ B e s t A r g a n d L am p , w ith b lu e c h im n e y , fo r b u r n in g m l 1 G a s L am p s m a d e to o rd e r. 0 0 8 0 5 0