CHAFFER MM. 



5 . unless it is desired to keep them 

 remains is to gel rid of the paraffin and 



may be. .Many solvents have 



,!,,,! f or this purpose :- -Turpentine, warm 



mixture of Pour parts of essence of turpentine 



,te,a mixture of turpentine and oil 



,luol, xylol, thin solution of Canada balsam 



; ,lv applicable to very thin sections), hot absolute 



j.lnha. or any other paraffin oil of low boiling- 



;it . of tin \ylol and toluol are generally in most 



tin- best. Ueii/.ol and chloroform are too volatile 



: manipulation. 



If tin- slide IK- warmed to the melting-point of the paraffin, 



ids will Hillice t> remove the paraffin if the slide 



plunged into a tube of \ylol or toluol. For thin sections, 



|n to lo M, it i- not necessai'y to irann at all. The sections 



in. muted direct from the xylol, or the slide may be 



Jit int<> a tub.- <>f alcohol to remove the solvent for 



>taini' 



ratlin x'.-tioii- can ! -taim-tl without removal of the paraffin, so 

 tli.-it at't.-r-tp-atni'-iit \\ith ;ilr.)h(il can be suppressed, but this is only 



[ti-'iialiv ai.lvaiita-vi.iis. 



151 Pure Paraffin.- h is now almost universally admitted 



t/ 



thai pure paraffin is superior for ordinary work to any of 



many mixi nres with wax and the like that used to le 



rarailin varies enormously in hardness ac- 



"rdiiiLr t" the temperature 1 of its surroundings. It should 



taken <!' a melting-point suitable to the 



nire nf the laboratory. .-1 paraffin welting at 50 C. 



harder, i< i hat whidi in my experience gives the 



90 long as ///< temperature of the laboratory is 



For higher temperatures a harder 



lire.l, ;md lor lower temperatures a softer one. 



"f undoubted e ..... petence prefer masses 



11 harder than this; so, for instance, Heidenhain 



M' ; "''y Rabl (56), Mayer (58 to 60 in 



; in winter aboul 56 , but never less than 50). 



"'" Hi:t :it Naples the temperature during 



summer and autumn is over 22 C. in 



tbe 1: metimes over 30. Temperatures such as 



