ADecembr;rPi9iT' }  Relations  of  Plant s  to  Distilled  Water. 
549 
Pepsin  number. 
Total 
acidity. 
Free 
acidity. 
Remarks. 
Case. 
Proposed 
method. 
Jacoby 
method. 
I 
5i 
26 
42 
100- 
Normal. 
2 
55 
42 
41 
100- 
DO. 
3 
58 
42 
42 
100- 
JJo. 
4 
60 
45 
41 
100- 
Do. 
5 
69 
49 
42 
100- 
Do. 
6 
7i 
49 
41 
100- 
Do. 
7 
7i 
53 
40 
100- 
Do. 
8 
89 
70 
40 
100- 
Do. 
9 
56 
3i 
21 
60-80 
Pellagra. 
IO 
57 
38 
40 
100- 
Do. 
ii 
69 
53 
33 
100- 
Do. 
12 
84 
64 
31 
100- 
Do. 
By  "  100-  "  is  meant  that  the  solution  is  almost  clear,  only  a  trace 
of  turbidity  being  left,  the  tube  containing  the  next  higher  concen- 
tration of  gastric  content  being  clear ;  therefore  it  is  more  exact  to 
say  "  100-."  From  this  table  it  is  seen  that  the  values  obtained  by 
my  method  correspond  to  about  four-tenths  of  those  of  Jacoby-Solms. 
1  Mett,  S.  G.  Bibliography. 
2  Solms,  Eugen,  Ztschr.  f.  klin.  Med.,  1907,  vol.  64,  p.  159. 
3  Rose,  William  C,  Arch.  Int.  Med.,  1910,  vol.  5,  p.  459. 
*  Goodman,  Edward  H.,  Am.  J.  M.  Sc.,  1908,  vol.  136,  p.  734. 
6  Tichomirow,  N.  P.,  Ztschr.  f.  physiol.  Chem.,  1908,  vol.  55,  p.  107. 
8Bergeim,  Rehfuss,  and  Hawk,  /.  Biol  Chem.,  1914,  vol.  19,  p.  345. 
1  N.  Nierenstein  and  Schiff,  Arch.  f.  verdaunngskrankheiten,  1902,  vol.  8,  p.  559; 
Berlin  klin.  Wochenschr.t  1903,  p.  268. 
SOME  RELATIONS  OF  PLANTS  TO  DISTILLED  WATER 
AND  CERTAIN  DILUTE  TOXIC  SOLUTIONS.* 
By  M.  C.  Merrill. 
I.  Introduction. 
In  view  of  the  extensive  use  of  distilled  water  as  a  medium  in 
which  to  grow  control  plants  for  comparative  purposes  in  solution- 
culture  work,  there  is  well-grounded  justification  for  the  performance 
of  considerable  experimental  work  in  order  to  determine  more 
definitely  the  relations  of  plants  to  this  medium.    The  subject  is  an 
*  Reprinted  from  Annals  of  the  Missouri  Botanical  Garden,  vol.  2,  No.  3. 
pp.  459-498. 
