STAECH-PEODTJCINQ PLAKTS, 335 

 Table No. I. — Density of starch deriyed from various plants. 



J^'ames of 

 Plants. 



1. Bitter cassava 



2. Tannia 



3. Arrowroot . . 



4. Arrowroot . . 



5. Common yam 



6. Sweet potato 



7. Arrowroot . 



8. Arrowroot . . 

 Tons les mcis 

 Sweet cassava 

 Wheat starch 

 Plantain 

 Tons les mois 

 Barbados yam 



13. Irish potato 



16. Guinea yam 



17. Potato 



18. Buck yam . . 



19. Arrowroot . . 



20. Arrowroot . . 



21. Maize 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 



Density, 



Tern, at 

 time of 

 Obs. F. 



1-4 3 



1-4773 

 1-4772 

 1-4748 

 -•4733 

 1-47 18 

 1-4717 

 1-4701 

 1-4698 

 1-4692 

 1-4632 

 1-4615 

 1-4611 

 1-4607 

 1-4589 

 1-4581 

 1-4561 

 1-4489 

 1-4443 

 1-4158 

 1-4109 



87. 



87- 



86-25 

 86-25 



83- 25 



85- 75 



82- 73 



84- 75 

 85'25 



86- 5 

 85- 



85- 75 

 84-25 



83- 5 



84- 75 



84- 2 

 84- 

 81-25 



85- 5 



86- 25 

 85-5 



Kemarks . 



Grown in the colony and prepared in the 



Colonial Laboratory. 

 Ditto ditto 

 Ditto ditto 

 Ditto ditto 

 Ditto ditto 

 Ditto ditto 

 St. Vincent's, commercial 

 Grown in the colony and prepared in C. L. 

 Ditto ditto 

 Ditto ditto 

 Commercial, of English manufacture 

 Grown in the colony and prepared in C. L. 

 Grenada, commercial 



Grown in the colony and prepared in C. L. 

 Tubers from Belfast; prepared in C. L. 

 Grown in the colony and prepared in C. L. 

 Commercial 



Grown in the colony and prepared in C. L. 

 Barbados, commercial 

 Bermuda, ditto 



Grown in the colony and prepared in C. L. 



Erom this it will be seen that the order of density does not cor- 

 respond with the order in any of the other tables. Probably those 

 specimens prepared from dry seeds, such as wheat and maize starch, 

 which, as commercial articles at least, are less pure than those pre- 

 pared from recently dug roots, have also the lowest density. 



Hygroscopic properties of starch produced from different plants. 

 — Such of the specimens as are marked in the following table, as 

 prepared in the colonial laboratory, were dried in the sun in shallow 

 trays, to which they had previously been transferred in the wet state. 

 When sun dried, the masses were broken down, and the starches 

 freely exposed to the air in the shade for ten days. Any adherent 

 masses were then rubbed to powder by light pressure in a glazed 

 mortar, and the whole sifted. Portions of each of these starches, and 

 of others for the sake of comparison, were then dried, at 212 degrees 

 Fahrenheit, in a current of dry air, and the loss determined : — 

 Table No. II. — Showing the hygroscopic water contained by starch 



PRODUCED FROM DIFFERENT PLANTS. 



1. Potato 



2. Sweet potato 



3. Buck yam . 



4. Barbados yam 



5. Arrowroot . 



6. Irish potato 



7. Guinea yam 



8. Tons les mois 



9. Arrowroot . 

 10. Common yam 



Per centage of water. 

 20-27 

 19-57 

 19-43 

 19-40 

 18-81 

 17-28 

 17-14 

 16-74 

 16-43 

 16-36 



Remarks. 

 Commercial, locality unknown 

 C, C. L.* 

 C, C. L. 

 C, C. L. 



Bermuda, commercial 

 Tubers from Belfast, C. L. 

 C, C. L. 



Grenada, commercial 

 Barbados, ditto 

 C, C. L. 



* The initial C. throughout these tables indicates that the plant was grown iu the colony 

 C. L., that the starch was prepared in the colonial laboratory. ' 



