340  Story  of  the  Papaw.  {Am"jSy'"i9oiarm* 
The  corrosive  constituent  is  not  volatile  and  remains  in  the  dried 
juice.  An  examination  of  many  of  the  preparations  sold  in  our 
market  under  the  name  of  "  papain,"  etc.,  shows  that  this  corrosive 
property  had  not  been  altogether  removed. 
ANALYSIS  OF  PAPAW  LATEX.12 
This  latex  is  an  emulsion  of  fats  and  wax,  containing  also  extrac- 
tive matters,  albumen  and  salts,  as  shown  by  the  following  : 
CARICA  LATEX— SUN-DRIED. 
Moisture  .  6*o6 
Soluble  ash    2  "64 
Insoluble  ash     478 
Matters  soluble  in  water  (including  ash  )   8274 
"  benzine  **....     11 '43 
"  ether   ....  977 
"  chloroform  11*20 
"  acetone  5  98 
"  alcohol    ....         .  .   7'i6 
ASH. 
Total  ash   7-42 
Soluble  ash     2*64 
Insoluble  ash   478 
Calcium  sulphate — insoluble  ash   .  .    0-896 
Calcium  phosphate       "         "    3  72 
Silica  "         "    0*164 
Calcium  sulphate — soluble  ash   1*024 
Potassium,  sodium,  lithium,  chlorides  and  carbonates — soluble 
ash     1*616 
Chlorine  ,   0*22 
Ferric  oxide   ...  trace 
Alcoholic  extract  (7*  16  per  cent.)  is  colored,  astringent  and  has  a 
somewhat  acrid  taste.  The  concentrated  extract  is  dark  brown, 
resembling  well  known  solid  extracts.  Evaporated  residue  is  only 
slightly  soluble  in  ether  and  chloroform,  but  is  partially  so  in  a  cold 
5  per  cent,  solution  of  sodium  hydrate.  It  is  further  dissolved 
upon  heating.  Alcohol  added  to  this  sodium  hydrate  mixture  dis- 
solves it  completely.  Acid  added  to  the  aqueous  or  alcohol  alka- 
line mixture  gives  a  saponification  indicating  resins. 
Some  observers  have  reported  a  glucosidal  body  in  the  Carica 
latex.    The  usual  tests  for  such  substances,  when  applied  to  this 
12  Owing  to  the  length  of  this  paper,  the  detailed  methods  of  analysis  have 
been  omitted.    In  most  cases  the  methods  were  those  in  common  use. 
