454 SUMMAEY OF CURRENT RESEARCHES RELATING TO 



Messrs. Scl.midt and nLsStt betwln tt" °^^^^ reflected light, 

 a glass plate inclined at an angk : Vgo tTthe axis of tt M c'' """"'"'l 

 very intense light from the side is then directe,rto the wTr*''- , ^ 

 turned towards the obiect ■ narl of thl 1? it "« '"^e of this plate 



tat part is reflected oXe'o^^t^LT^tL''^::^:::!^^^ ^'f • 

 mmation tbe iron surface annpars in Z T ^™^g^^^^* of the illu- 

 and is observed thro^ the Xt^^^^^^ eharactenstic tarnish colours, 



Bastelbekge r.— Uses of Photomicrography. 



Shekston., J. C.-How to take Photomtrogtap^r^"^" "' '' ^''''^ P^" '''-'^- 



Pharmaceutical Journ., 1889, April 6 (1 fig.). 



C5) Microscopical Optics and Manipulation 

 Bessey C. E.-The need of making Measurements in microscopical work 



PCX, A.-Ie Microscope et sa theorie. ^^m:::l:^^^[^^^ PP" ^^-S. 



Ro vs.o. P.Go.., G W Mieroseopicaf IltcrtTv!^I^Vr '^^^ '^^• 

 [Apochromatic results. Apochromatic focal planes 1 ^ "^ "^ ^^ ^ ^• 



Engl. MecK XLIX. (1889) pp. 123-4 (6 figs.), 209-10 (4 fi^s ) 



7 " ^ ,.. " Microscopical Imagery. Solar Splendours ° ^^^ 



/o«.«. 0/ M^roscopylL (1889) pp. 14-^5 ('l pi.), loSa^p^and 1 fi. > 



ruTi, "x .• .",. ■*■ New Apochromatic Test. ^ ^ "&•> 



fi-Ti^;. JfecA., XLIX. (1889) p. 156 

 Aperture Table.— In the table printed at r 9q9 f^^ .p +i ^ 



■: %ttfru &"1TI V'^^™ ^ee'n-t?al red.' ^fe! 

 = -729 and not -rat'^Thf ""f ''°* T *"'"" "^ P™""'' ^'S? N.I 

 shonldheTs'sl' and nofw" 61^ ""^ ''"'-P^^-g toO-66N.A. 



C6) Miscellaneous. 



from the post-mark which it bears .'- ' ^^*^ ^'"^^ ^"^^^^'^ 



"Down, Farnboroiigh. Kent, 

 My Dear Owen, Sunday [March 2u' 1S48]. 



evenif^he^U-rtrenffn^irrL™- tf ?'''"''' "^ ^-' '"^ ^ut 

 absolutely superfuous but f Lt.7 -^ "i""" i' ?'" K"'"? '» ''•"''' ^'1 be 



.wn,y^new^i™i?£.Lt;:,tn^:^^^^^^^^^^^ 



* Journ. New York Micr. Soo., v. (1S89) pp. 79-81. 



