f the pongam tree, which
flourishes in East India, has been suggested as available for the soap
industry, but the unsaponifiable matter present would militate against
its use. Lewkowitsch (_Analyst_, 1903, pp. 342-44) quotes these
results:--

_____________________________________________________________________
| | | | | |
| | Saponi- | | | |
| | fication | Iodine | Acidity, | Unsaponifiable, |
| | Equi- | No. | Per Cent. | Per Cent. |
| | valent.[7] | | | |
|_________________|____________|________|___________|_________________|
| | | | | |
| Oil extracted | 315 | 94 | 3.05 | 9.22 |
| in laboratory | | | | |
| Indian specimen | 306 | 89.4 | 0.5 | 6.96 |
|_________________|____________|________|___________|_________________|

_Margosa oil_ is obtained from the seeds of _Melia azedarach_, a tree
which is found in most parts of India and Burma.

Lewkowitsch (_Analyst_, 1903, pp. 342-344) gives these figures:--

__________________________________
| | | |
| Saponification | Iodine | Titre, |
| Equivalent.[8] | No. | deg.C. |
|________________|________|________|
| | | |
| 284.9 | 69.6 | 42 |
|________________|________|________|

_Dika fat_ or _Wild Mango oil_ is obtained from the seed kernels of
various kinds of _Irvingia_ by boiling with water. Lemarie (_Bulletin
Imp. Inst._, 1903, p. 206) states that this fat is used in the place of
cocoa-nut oil in the manufacture of soap. Lewkowitsch (_Analyst_, 1905,
p. 395) examined a large sample of dika fat obtained from seeds of
_Irvingia bateri_ (South Nigeria) and gives the following data:--

____________________________________________________
| | | | |
| Saponification | Iodine | Titre, | Unsaponifiable, |
| Equivalent.[9] | No. | deg.C. | Per Cent. |
|________________|________|________|_________________|
| | | | |
| 229.4 | 5.2 | 34.8 | 0.73 |
|________________|________|________|_________________|

_Ba