- 2 - R. Caspary May 27, I857 
Dr. Waßrner in Berlin knows Wickershayn best.because he saw a lot. 
is however perhaps too onesided influenced for Oberhauser, who.by 
the way considers Nachet eqnivalent to it. Wherever you orrier an In- 
strument . cond i ser first the followin^?: three points::!) the table rriust 
be turnable. 2) The mirror must be so installed, that it has aUrSided 
movement, and that cross-li^^htin^: can be achieved. A Wickershay, which 
does not have these two - specially no.2 - can not be used. Schick 
manufactures both recently, as I hear.but I have not yet seen an In- 
strument of this kind from hira.. The instrument of Prin^sheim-, on 
which he fi:ot used to once, does not have either, It's ima^re is al- 
ways faint and non-di stinct^ in circujnf er^ence as that of my predeces- 
sor. Foryears, since l849,Vmade an effort, to see and prove as many. 
microscopes as possible. I consider the en^rlish ones as the best.but 
they are sky-high (the Ge^^man word is »'unpayable" in verbatira transl.. 
E.D.) and have many useless sradprets (The Ge^^man word is Aparat = machi. 
nery,E.D. ). The French follow then.and are really not inferior to the 
EnRlishj TheiTprice is obtainable; the Germans are little indepenr - 
dend and mos^ly imitations of the French. America* s instruments are 
for most workers.who must brinp- the lense into water. not useable., 
because reapcents can not be used with them.. 
Joh. Muller may be knom as No. 1 as anatomist and physicist, but not 
as expert of Wikerha^en; less so Ehrenberg.. 
With best greetings to your wife and Georg your most devoted" 
R« Caspary 
(translated from German script' by Edß-ar Denison, Aupcust I988 ) 
