\"piV,'mi!'}^^^^''^^'^^  f^^'  Desiccated  Thyroid  Glands  409 
with  the  Bauniann  method,  upon  quite  a  large  number  of  samples 
of  commercial  desiccated  thyroid  glands.  The  agreements  in 
duplicate  determination  by  the  Hunter  method  were  found  to  be 
considerably  more  uniform  than  those  by  the  Baumann  method, 
and  the  results  in  practically  every  case  were  from  10  to  15  per 
cent,  higher.  Since  there  is  a  reasonable  source  of  loss  at  one  step 
of  the  Baumann  method,  viz.,  the  acidification  of  the  aqueous 
solution  of  the  fusion  residue,  and  this  particular  cause  of  loss  has 
been  obviated  by  Hunter  in  his  method,  there  can  be  little  doubt 
that  the  higher  results  are  the  nearer  correct. 
Of  the  commercial  samples  which  we  have  so  far  examined, 
some  were  purchased  on  the  market  during  1907,  and  the  others 
recently  received  direct  from  two  American  firms  which  prepare 
thyroid  glands  for  medicinal  use.  For  these  latter  we  herewith 
acknowledge  our  indebtedness  to  Armour  and  Co.,  and  Parke,  Davis 
and  Co.  The  samples  received  direct  are  portions  of  the  several  lots 
prepared  at  the  particular  dates  shown  in  the  table. 
Percentage  of  Iodine  in  Commercial  Desiccated  Thyroid  U.  S.  P.  as 
Determined  by  the  Hunter  Method. 
Laboratory  g^^^^^  Per  cent.  I.    L^bomory         g^^^^^  Percent.!. 
99  P.  D.  &  Co.  (1907)  0.185  104  Armour  &  Co.  (1907)  0.138 
99(a)  P.  D.  &  Co.  (1907)  0.185  107  Armour  &  Co.  (1907)  0.145 
100  P.  D.  &Co.  (1907)  0.188  108  Armour  &  Co.  (1907)  0.138 
101  P.  D.  &  Co.  (1907)  0.153  109  Armour  &  Co.  (1907)  0.141 
102  P.  D.  &  Co.  (1907)  0.162  109(a)  Armour  &  Co.  (1907)  0.142 
103  P.  D.  &  Co.  (1907)  0.219  119  Armour  &  Co.  (1907)  0.135 
105  P.  D.  &  Co.  (1907)    0.138       120  Armour  &  Co.  (1907)  0.129 
106  P.  D.  &  Co.  (1907)  0.218  121  Armour  &  Co.  (1907)  0.140 
106(b)      P.  D.  &  Co.  (1907)  0.212 
116  P.  D.  &  Co.  (1907)    0.118                                        Average  0.138 
117  P.  D.  &  Co.  (1907)    0.117       345  Armour  &  Co.  Dec.  16,  '09  0.279 
118  P.  D.  &Co.  (1907)    0.158       346  Armour  &  Co.  Jan.  23,  '10  0.095 
Average    0.171       347  Armour  &  Co.  Feb.  15,  '10  0.212 
348  Armour  &  Co.  April,   '10  0.162 
358  P.  D.  &Co.  (1911)    0.206       349  Arniour  &  Co.  May,  '10  0.146 
359  P.  D.  &  Co.  (1911)    0.206       350  Armour  &  Co.  June,  '10  0.271 
360  P.  D.  &  Co.  (1911)    0.154       351  Armour  &  Co.  July,  '10  0.202 
361  P.  D.  &  Co.  (1911)    0.214       352  Armour  &  Co.  August,  '10  0.231 
Average   0.195       353  Armour  &  Co.  Sept.,  '10  0.215 
354  Armour  &  Co.  October,   '10  0.144 
355  Armour  &  Co.   Nov.,  '10  0.252 
356  Armour  &  Co.  Jan.   16,  '11  0.219 
Average  0.202 
•    -.1'     '¥                       Thyroid  Proteid  (Armour)  0.607 
