Photographic copies of drawings of various substances as seen under the microscope: designed to aid in the detection of adulteration of tea, coffee, tobacco, etc. The originals were drawn from nature by Rochfort Connor, Asst. to the Inland Revenue Laboratory, Somerset House, 1861. /1. Coffee/Chicory. /2. White Mustard/Red Mustard. /3. Husks & Skins of Cereals - Barley, Oat. /4. Grains of Paradise/Cocculus Indicus. /5. Black Pepper. /6. Rhubarb/ Dock/ Burdock. /7. Locust Bean - pod and seed tissues. /8. Mangel Wurzel/Turnips /9. Husks & Skins of Cereals. Wheat, Rye, Maize, Durra (sorghum vulgaris) /10. Linseed/ Linseed Meal. /11. Capsicum. /12. Thorn Apple/Cabbage/Lettuce. /13. Coltsfoot/Foxglove/Chicory. /14. Starches. Tous-les-mois, Potato, Sago, Orris Root, Bean, Pea. /15. Tobacco. Green Virginian leaf grown in England. /16. Tea. black and green. /17. Tobacco. dry as imported Virginian leaf. /18. Starches. Wheat, Barley, Rye, Oat, Maize, Rice. /19. Tobacco (Virginian leaf) dry as imported. /20. Grains of Paradise. Cocculus Indicus. /21. Various leaves: Sloe, Elder, Willow. /22. Leaf of Sphagnum Irish Bog Moss/ Ground Valonia/Ground Fustic.