.  .Jour.  Puaim.  j 
September,  i9oo.  /        Investigation  of  the  Tannins.  433 
The  estimation  of  these  barks  showed  the  following  figures  : 
Name. 
Moisture. 
Ash  in 
Absolutely- 
Dry  Bark. 
Tannin  in 
Absolutely 
Dry  Bark. 
Rhizophora  conjugata    .  .  . 
671 
9-58 
17-90 
Bruguiera  caryophylloides  . 
6-59 
9'55 
8-96 
Rhizophora  mucronata  .  .  . 
7*00 
8-8o 
.  I9"57 
Bruguiera  parviflora  .... 
7-68 
7'37 
7-98 
Bruguiera  rheedii  
8*n 
7-24 
19*37 
Sumnitzera  coccinea  .... 
9*01 
7*53 
11*75 
Carapa  mollucana  ..... 
9-29 
10-23 
27-56 
Ceriops  candolleana  .... 
7*22 
IO-2I 
24-19 
ROSACEA. 
Potentilla  Norwegica  and  Potentilla  Canadensis. — The  material 
for  the  work  upon  Potentilla  norwegica  was  collected  near  St. 
David's,  Pa.,  on  August  26,  1896.  The  several  parts  were  separated 
as  indicated  in  the  following  tabulation  of  results: 
I,eaves  and 
Root.  Stem.  Flower-heads. 
Moisture  9-55  10*75  17-20 
Ash  in  absolutely  dry  material  .  6*30  4-31  9*96 
Tannin  in  absolutely  dry  material  ....   2*22  0-45  4*13 
The  ashes  of  the  several  parts  consisted  of  magnesium,  calcium, 
potassium  and  iron  combined  with  carbonic,  sulphuric,  hydrochloric 
and  phosphoric  acids. 
On  May  24,  1894,  some  leaves  were  collected  from  Potentilla 
canadensis,  at  St.  David's,  Pa.    These  upon  estimation  showed : 
Per  Cent. 
Moisture   .  .   ,  .  .  72*13 
Ash  in  absolutely  dry  material  9-90 
Tannin  in  absolutely  dry  material  •   ..  13*34 
Brain  Matter  in  Mii,k.—  Henry  Leffmann  records  the  adulteration  of 
calves'  and  sheep's  brains  in  milk,  and  considers  the  adulteration  a  dangerous 
one  because  of  the  liability  of  the  brain  to  contain  virulent  microbes  and  the 
localization  there  of  certain  stages  of  dangerous  entozoa.— Jour.  Amer.  Chem. 
Soc,  1900,  p.  356. 
