Dr. E. J. Mills's Researches on Melting-point. 



21 



Table XVIII. 





D. 



B r 



0,. 



E. 



A v 



A 2 . 





44-31 



44-29 



44-29 



44-22 



4-28 



4431 





•29 



•29 



•24 



•25 



•25 



•31 





•24 



•24 



•18 



•25 



•31 



•23 





•33 



•18 



•10 



•22 



•28 



•17 





•24 



•32 



•29 



•27 



•28 



•25 





•29 



•26 



•29 



•27 



•23 



•39 





•37 



•29 



•29 



•30 



•28 



•31 





•33 



•32 



•21 



•22 



•31 







•24 



•21 



•29 



•27 



•31 







•33 



•32 



•21 



•29 

 •29 



•25 



•28 

 •28 







44-30 

 •009 



44-27 

 •010 



4425 

 •012 



44-25 

 •005 



44-28 

 •005 



44-28 

 •017 



Probable error ... 



Thermometer ... 



2 



3 



3 



2 



3 



3 



2. /3 Mononitrophenol. — /3 mononitrophenol is the less vola- 

 tile mononitrophenol of the two produced by Fritsche's process 

 (Jonrn. prak. Chem. lxxv. p. 257). The crude stock was con- 

 verted into sodic salt, washed with aqueous sodic hydrate, dis- 

 solved in water, and precipitated by hydric chloride: a sodic salt 

 prepared from this contained 14' 17 instead of 14'31 per cent, 

 of sodium, the preparation being effected with but very little 

 loss. 



Aj was crystallized thrice from naphtha and once from 

 water ; A 2 was the same, twice crystallized from water ; B 1} 

 B 2 , B 3 were all crystallized together thrice from naphtha, 

 in one quantity; and this was crystallized thrice from water. 

 All the specimens were dried over oil of vitriol in the dark for 

 about two months. 



/3 mononitrophenol becomes pale dirty yellow on exposure to 

 light for a day, especially if a part of it has been melted. As 

 the coloured product probably melts below the temperature 

 at which the uncoloured substance does; and as a broad gas- 

 flame must tend somewhat to produce the same effect as day- 

 light, the long stage of incipient fusion and the uncertainty 

 of the limit are accounted for. 



