repared in Barbados. Characteristics the
same, but globules more uniform in size.

14. Ditto ditto, grown on plantation Enmore; not quite so uniform in
size.

15. Bitter Cassava (_Janipha Manihot_).--Grown on Haagsbosch
plantation. A few globules occur as large as the 1-1,000 of an inch;
these are ovate, the rest are spherical. The range is from 1-2,000 to
1-8,000; general size, 1-4,000.

16. Sweet Cassava (_Janipha Loeflingii_).--Grown on No. 1 Canal,
Demerara River.

17. Tannia (_Caladium sagittifolium_).--Grown at the Lodge. Globules
not so truly spherical as the foregoing, but range and size the same.

18. Wheat (_Triticum sativum_).--Locality unknown. Form of globules,
spherical and slightly elliptical, some very small; range, 1-2,000 to
1-6,000, the former the general size.

19. Maize (_Zea Mays_).--Grown in the colony, but locality uncertain.
Globules, approaching to spherical, much aggregated; range, 1-2,000 to
1-4,000; general size, 1-3,000.

From an inspection of this list, it does not appear that the species
would be easily distinguishable, and it is not easy briefly to
describe the differences; in practice, however, and especially when
the observer has a number of pure and authentic specimens before him,
to have recourse to as standards of comparison, the discrimination is
by no means difficult.

_Specific gravity of starch derived from various plants_.--Of many
bodies the determination of the specific gravity is one of the best
modes of distinguishing the purity. With the view of ascertaining
whether the different varieties of starch have all the same density,
as has been asserted by some, trials were carefully made of as many
specimens as I could procure. The results are embodied in the
following table:--

TABLE No. I.--DENSITY OF STARCH DERIVED FROM VARIOUS PLANTS.
------------------+-------+-------+-----------------------------------------
| |Tem. at|
Names of |Density|time of| Remarks
Plants | |Obs. F.|
------------------+-------+-------+------------------------------------
1. Bitter cassava|1.4 3 | 87. |Grown in the colony and prepared in
| | | the Colonial Laboratory.
2. Tannia |1.4773 | 87. |Ditto ditto
3. Arrowroot |1.4772 | 86.25 |Ditto ditto
4. Arrowroot |1.4748 | 86.25 |Ditto ditto
5. Common yam