568 
Peptones. 
Am.  Jour.  Pharm. 
Nov.,  1886. 
aqueous  solution  by  ether.  With  alkalis  it  forms  gummy  salts,  which 
dissolve  in  water  and  alcohol,  and  are  not  decomposed  by  carbonic 
anhydride.  With  silver  nitrate  in  limited  quantity  it  forms  the  com- 
pound C19H24N305Ag,  which  is  precipitated  by  alcohol  in  the  form  of  a 
brown  powder.  Hot  concentrated  potash  or  boiling  hydrochloric  acid 
converts  jaboric  acid  into  pilocarpidine  and  /3-pyridine-a-lactic  acid. 
Alcoholic  solutions  of  jaboric  acid  give  with  platinic  chloride  in 
limited  quantity  a  viscous  precipitate  of  the  compound 
(C19H25N305)2,PtCl4; 
with  platinic  chloride  in  excess,  a  yellow  precipitate  of  a  hemiplatino- 
chloride,  (C19H25N305)2,PtCl4  +  2C19H25N305,PtCl4.  With  auric  chlo- 
ride a  diaurochloride,  C19H25N305,2AuCl3,  is  formed.  The  hydrochlo- 
ride and  nitrate  of  jaboric  acid  are  viscous  substances ;  an  aqueous 
solution  of  the  former  gives  a  viscous  precipitate  of  the  composition 
(C19H25N305)2,H2PtC]6,  with  a  limited  quantity  of  platinic  chloride. 
Jaborine  and  jaboric  acid  are  products  of  the  condensation  of  pilo- 
carpine, this  condensation  taking  place  on  the  betaine  nucleus,  and 
may  be  thus  represented  (Py  =  pyridyl) : — 
NMe^CMePy/3-COO 
1N  1Vie3— OCOCMePy^^  Me3' 
Jaborine. 
OH-CMePy/3-COONMe3-CMePy/9-COOH. 
Jaboric  acid. 
C.  H.  B. 
— Jour.  Chem.  Soe.,  September,  1886,  p.  815;  Compt.  rend,  cii. 
PEPTONES. 
By  W.  Kuhne  and  R.  H.  Chittenden. 
Ammonium  sulphate  precipitates  from  a  solution  all  proteids  but 
peptones.  Peptones  can  in  this  way  be  obtained  free  from  albu- 
moses,  with  which  they  have  in  previous  researches  always  been 
mixed.  It  was  therefore  necessary  to  repeat  many  previous  experi- 
ments concerning  the  composition  and  properties  of  peptones.  Am- 
phopeptone,  the  mixture  of  peptones  obtained  in  gastric  digestion, 
and  antipeptone,  from  tryptic  digestion,  were  thus  examined.  The 
result  of  digestion  was  acidified  with  acetic  acid,  saturated  with 
ammonium  sulphate,  filtered,  the  filtrate  evaporated  to  small  bulk, 
and  filtered  from  the  crystals  of  the  salt  which  separated;  the 
