ioo  Analysis  of  the  Gastric  Contents.     { A£ebr°uaryP iST* 
the  qualitative  tests  or  the  total  acidity  are  abnormal  further  analy- 
sis is  absolutely  necessary — as  the  estimation  of  the  amounts  of 
separate  acid  factors  and  of  the  ferments. 
II.     RECORD    OF   THE  ANALYSES  OF  THE  GASTRIC  CONTENTS  OF  FIFTY 
HEALTHY  INDIVIDUALS. 
The  characteristics  of  the  normal  gastric  contents,  as  investigated 
by  the  method  described,  have  been,  to  some  extent,  outlined  in  the 
description  of  the  method.  Stated  collectively,  these  characteristics 
are  as  follows : 
Gastric  contents  expressed  one  hour  after  Ewald  breakfast. 
Total  quantity  of  mixed  contents,  36  to  200  c.c 
Total  quantity  of  filtrate  contents,  20  to  140  c.c. 
Free  hydrochloric  acid,  present. 
Lactic  acid,  absent. 
Butyric  acid,  absent. 
Acetic  acid,  absent. 
Proteids.  Native  proteids  (albumin  or  globulin)  are,  as  a  rule, 
present  in  the  filtrate  in  very  slight  traces.  Acid  albumin,  present. 
Albumoses  and  peptones,  present. 
Carbohydrates.  Starch  is,  as  a  rule,  absent  in  the  filtrate,  but 
may  be  present.  Erethrodextrin  is  frequently  present.  Dextrin 
and  sugars  are,  in  a  majority  of  cases,  the  only  carbohydrates  pres- 
ent in  the  filtrate. 
Total  acidity  of  contents,  1-50  to  3  grammes  per  mille. 
Total  hydrochloric  acid,  1-15  to  2  48  grammes  per  mille. 
Total  combined  hydrochloric  acid,  0  24  to  I -49  grammes  per  mille. 
Total  organic  acids  and  acid  salts,  0-20  to  0-88  grammes  per  mille. 
Total  free  hydrochloric  acid,  01  to  1-90  grammes  per  mille. 
Mean  ri2. 
Period  necessary  to  digest  0-005  gramme  of  coagulated  egg  albu- 
min in  25  c.c.  of  contents,  2  to  3^  hours. 
Pepsin  present.  Quantity,  80  to  90  per  cent.  Hammerschlag 
method  (page  43). 
Rennin  present.    Quantity,  one-twelfth  to  one-fortieth  dilution. 
Rennet  zymogen,  present.  Quantity,  one-sixtieth  to  one  one-hun- 
dred fiftieth  dilution  (by  Friedenwald's  tables,  referred  to  on  page 
44). 
The  data  just  given  are  taken  directly  from  the  collected  results 
