488 
Ethyl  Nitrite. 
Am,  Jour.  Pharm. 
Oct.,  1887. 
Taise  from  16*3°  to  16*6°  C.  At  16-7°  C.  it  remained  for  twenty-five 
minutes  ;  while  it  required  an  hour  to  reach  above  16*8°  S.  Between 
the  temperatures  16' 3°  C.  and  16*8°  C.  one  ounce  was  obtained.  The 
rise  in  temperature  up  to  16*9°  C.  required  one  hour.  When  it  ran  up 
to  17°  C.  two  ounces  had  been  obtained.  The  receiver  was  now 
•changed  and  one  and  a  half  ounces  were  obtained  at  this  temperature. 
At  17*2°  C.  all  of  the  liquid  had  distilled  over;  the  barometric 
pressure  was  7  58  •  7  mm. 
Lea's  ethyl  nitrite,  treated  in  the  same  manner,  started  at  16,1°C, 
and  ran  rapidly  up  to  17'3°C.,  and  finished  at  17*8°C.  Barometer 
pressure  759*2  mm. 
Grosourdy's  ethyl-nitrite,  at  760  mm.  barometer  pressure,  distilled 
between  19'38°C.  and  19'88°C. 
SPECIFIC  GRAVITY. 
This  was  taken  at  0°C.  by  means  of  a  delicate  Sprengel  picnometer. 
Liebig  found  the  sp.  gravity  at  15°C  947 
Brown     "  "  15'5°C  900 
Mohr      "  "  15-5°C  898 
Dumas  and  Boullay  found  the  sp.  gravity  at  +  4°C  886 
The  mean  of  6  determinations  made 
Liebig's  ethyl-nitrite  at  0°C  919 
Lea's      "         "         "   920 
This  is  using  the  ethyl  nitrite  before  fractioning  it. 
From  the  results  of  these  experiments,  I  think  it  may  be  fair  to 
conclude : 
1st.  That  ethyl  nitrite  has,  as  yet,  not  been  made  colorless,  and  that 
It  is  light-yellow. 
2d.  That  the  boiling  points,  16°  to  16#5°  C,  are  probably  too  low, 
and  that  18*5°  to  21  °C  are  possibly  too  high;  also,  that  the  boiling 
point  given  by  most  French  and  some  German  works,  17°  C,  is  the 
nearest  correct. 
3d.  The  specific  gravity  of  *947  at  15°  C,  is  undoubtedly  too  high, 
as  it  has  not  been  corroborated ;  that  *886  at  +  4°  C.  is  too  low,  and 
that  *900  at  15*5°  C.  is  nearest  and  about  right. 
It  is  unfortunate  that  most  of  the  authorities  do  not  say  which 
method  was  used  to  prepare  the  ethyl  nitrite;  it  is  here,  without  doubt* 
