286 
Mucilage  in  Plants. 
Am.  Jour.  Pharm. 
June,  189a 
of  the  important  official  plants  yielding  a  mucilage,  together  with 
the  origin  of  the  same,  is  given : 
I .  Cel  I -Con  ten  ts  M u  cilage . 
1.  Corm  of  Orchis  sp.  (Salep). 
2.  Rhizome  of  Agropyrum  repens,  L.,  Beauvois  (Triticum). 
3.  Bulb  of  Urginea  maritima,  L.,  Baker  (Squill). 
4.  Bulb  of  Allium  sp.  (onion,  garlic). 
5.  Stem,  leaf  and  elements  of  flower,  excepting  stamens,  of  Viola  tri- 
color, L. 
6.  Flower-stalks  of  Hagenia  abyssinica,  Bruce,  Gmelin  (Cusso). 
7.  Pulp  of  fruit  of  Musa  paradisiaca  (Banana) . 
8.  Succulent  plants,  as  Aloe,  etc. 
II.  Cell- Me  nib  vane  Mucilage. 
A.  Secondary  thickening  of  wall. 
1.  Root  of  Althcea  officinalis,  L.,  (Althaea). 
2.  Bark  of  Cimiamomum  sp.  (Cinnamon). 
3.  Bark  of  Rhamnus  Frangula,  L.  (Buckthorn). 
4.  Bark  of  root  of  Sassafras  variifolium,  Salisbury,  o.  Kuntze  (Sassafras). 
5.  Inner  bark  of  Ulnius  fulva,  Mx.  (Elm). 
6.  Leaves  of  Barosma  betulina,ThmibeTg,  Bart,  et  Wend,  and  B.  crenu- 
lata,  L.,  Hooker  (Buchu). 
7.  Seed-coat  of  Cydonia  vulgaris,  L.,  (Quince). 
8.  Seed-coat  of  Linum  usitatissimum,  I,.  (Flaxseed). 
9.  Seed-coat  of  Sinapis  alba,  L.,  Hook,  fil  et  Thompson,  and  5.  nigra, 
L.,  Koch  (White  and  Black  Mustard). 
B.  Metamorphosis  of  Cell-wall. 
a.  Pith  and  Medullary  Ray  Cells. 
1.  Astragalus  sp.,  yielding  Tragacanth.  1 
3.  Parenchyma  cells  of  wood  and  bark.2 
1.  Cherry-gum,  yielded  by  some  of  the  Amygdalacese. 
} .  Various  cells  of  the  bark. 
1.  Acacia  Senegal,  Wild.,  yielding  Gum  Arabic.3 
6.  Primary  wall  as  ititercellular  substance. 
1.  Thallus  of  Chondrus  crispus,  Stackhouse,  and  Gigartina  mamillosa, 
J.  Agardh  (Irish  moss). 
III.  Secreting  Hairs  {Driizenzotten). 
1.  Leaf  and  calyx  of  Viola  tricolor,  L. 
2.  Leaf  of  Coffea  arabica,  L.  (Coffee). 
3.  Leaf  of  Prunus  avium.* 
1  Mohl,  Bot.  Zeit.,  1857,  S.  33. 
1  Tschirch,  Angewandte  Pflanzenanatomie,  S.  210. 
■'  Wigand,  Pringsheim's  Jahr.,  Ill,  115,  Mceller,  Wiener  Akad.,  1S75,  219. 
Tschirch,  loc.  cit.,  213. 
'  J.  Reinke,  Bot.  Zeit.,  1874,  47  and  59. 
