Am'jJu°nUei;,i3P86arm-}  North  American  Conifer  cb.  321 
tion  of  gallotannic  acid,  are  here  added  for  comparison  v/ith  the 
amounts  of  the  three  constituent  elements  indicated  by  the  com- 
bustions of  the  tannins  of  the  six  Ericaceae. 
The  insight  into  the  compositions  of  the  principles,  which  the 
ultimate  analyses  afforded,  undoubtedly  indicates  that  the  tannins 
obtained  from  trailing  arbutus,  gaultheria  and  mountain  laurel  have 
the  same  centesimal  composition  as  that  class  of  these  compounds 
of  which  oak  bark  tannin  is  the  most  common  representative  ;  and 
that  the  tannins  from  manzanita  and  uva  ursi  contain  the  same  pro- 
portions of  carbon,  hydrogen  and  oxygen  as  does  gallotannic  acid. 
It  will  be  seen  that  the  results  obtained  for  the  tannin  of  chima- 
phila  do  not  closely  agree  with  the  percentage  composition  of  either 
class.  This  tannin  was  particularly  difficult  to  purify.  Two  differ- 
ent lots  of  the  drug  were  extracted  for  its  tannin  with  the  same 
success,  for,  even  after  repeated  purifications,  the  results  of  combus- 
tion were  found  to  be  constant,  as  is  shown  above.  But  these  com- 
bustion figures  certainly  indicate  greater  resemblance  to  the  oak 
bark  tannins  than  to  gallotannic  acid,  as  also  did  the  general  chem- 
ical behaviors  of  the  tannin  in  the  processes  of  decomposition  and 
the  characters  of  the  products  so  obtained. 
In  conclusion,  it  seems  justifiable  to  believe  that  sufficient  evi- 
dence has  been  presented  to  prove  the  existence  of  the  two  kinds  of 
tannin  in  the  uninjured  or  normal  tissues  of  a  single  order,  a  fact 
which  substantiates  the  idea  that  either  kind  of  tannin  may  be 
physiological. 
A  CONTRIBUTION  TO  THE  KNOWLEDGE  OF  SOME  - 
NORTH  AMERICAN  CONIFERS. 
By  Edson  S.  Bastin  and  Henry  Trimble. 
{Co?iti?iued  from  page  2%.) 
PINUS   RESINOSA,  AITON. 
RED  PINE — NORWAY  PINE. 
GENERAL  CHARACTERS. 
This  is  a  tree  with  a  straight  bole,  attaining  a  diameter  of  about 
2  feet  at  the  base,  and  a  height  of  from  75  to  150  feet.  It  has  a 
rather  regularly  and  distantly  fissured  bark,  which  is,  between  the 
fissures,  smoother  than  in  most  of  the  other  species,  and  of  a  red 
color,  whence  the  common  name,  red  pine.    The  cones  are  terminal, 
