June  i,  1893.] 
THE  TROPICAL  AGRICULTURIST. 
1 3* 
increased — thus  B.  Kozai  (Journal  Cliem.  Soc. 
quoted  from  Bied.  Centr.  1892)  found,  that,  if  the 
tea  shrub,  for  three  weeks  before  plucking  he 
encased  so  as  to  exclude  the  light,  the  leaves 
are  etiolated  and  vary  in  composition  from  those 
in  full  light  as  follows: — 
Grown  in 
dark- 
Grown  in 
light. 
Theine 
Total  nitrogen  ... 
Nitrogen  in  theine 
Precentage  of  theine  1 
nitrogen  on  total  ^ 
nitrogen  ...  j 
p.c. 
4-532 
7-835 
1-311 
16-72 
p.c. 
3-784 
6 945 
1-094 
15  75 
Assam  plant : 
Pekoe  leaves 
,,  souchong 
,,  coarser  leaves 
than  used  in 
manufacture 
China  plant : 
Pekoe  leaves 
,,  souchong 
,,  coarser  leaves 
than  used  in 
manufacture 
Ceylon  plant : 
Unassorted  16th  Apl. 
,,  3rd  May 
,,  16th  May 
Percentage. 
Ex- 
tractive. 
j Total  asli. 
Ash 
soluble  in 
water. 
Ash 
insoluble 
in  water. 
54-0 
5-87 
3-49 
2-38 
52-3 
6-19 
3-42 
2-77 
50-9 
8-50 
2-63 
5-87 
48-9 
5-45 
3-36 
2-09 
49-3 
616 
3-39 
2-77 
399 
7-57 
2-75 
4-82 
49-91 
5-25 
3-59 
1-66 
47-77 
5-45 
3-62 
1-83 
47-71 
5-26 
3-48 
1-78 
44-89 
5-32 
3-70 
1-62 
In  both  of  these  analyses  the  percentage  of  total 
nitrogen  is  very  high.  The  proportion  of  nitrogen 
in  tea  grown  under  natural  conditions  appears  to 
range  from  about  2'6  to  7 per  cent.  There  is 
usually  a somewhat  larger  proportion  of  nitrogen 
in  tea  than  is  accounted  for  by  the  theine  and 
albumenoids  present.  This  nitrogen  exists  as 
an  amide.  In  Japan  tea,  at  different  times  of  the 
year,  Kellner  found  amido-nitrogen  to  vary  from 
nil  to  '66  per  cent. 
Unprepared  Tea  Leases. 
Comparatively  few  analyses  of  unprepared  tea 
leaves  (with  the  exception  of  Japan  tea  leaves) 
have  been  made  ; but  the  following  determinations 
of  certain  constituents  in  Assam,  China  and 
Ceylon  tea  leaves  are  interesting.  In  the  case  of  the 
Assam  and  China  plants  the  determinations  were 
made  in  London  with  unprepared  leaves  received 
direct  from  India  by  Dr.  Bell.  In  the  case  of  the 
Ceylon  plant  the  determinations  were  made  by 
the  author  in  green  leaves  received  a day  or  so 
after  they  had  been  plucked.  The  Ceylon 
samples  were  all  from  the  same  estate. 
Amounts  of  extractive,  of  soluble  and  insoluble 
Ash  in  the  unprepared  leaves  of  the  Assam, 
China,  and  Ceylon  Tea  plant. 
One  hundred  parts  of  the  ash  of  the  Ceylon 
tea  leaves  contained  potash  41 '96  lime  10 '24 ; 
and  phosphoric  achl  lb  04, 
I quote  from  the  Journal  of  the  Chemical 
Society  the  following  elaborate  analyses  of  green 
tea  leaves.  These  are  the  more  interesting  as 
they  form  almost  the  only  case  in  which  system- 
atic analyses  have  been  made  of  an  evergreen 
plant  at  intervals  during  a large  portion  of  the 
year,  including  the  whole  time  dining  which  the 
leaves  are  harvested.  The  analyses  are  by  Pro- 
fessor O.  Kellner  of  Tokio.  The  leaves  were  from 
50  nine-year  old  trees  on  the  estate  of  the 
Minister  of  State,  the  Marquis  of  Nabeshima, 
near  Tokio. 
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