PLATE I. 



1. A representation in miniature of an inflated sheep bladder. 



2. Part of same cut across its length, 



3. A collection of same supposed to be held together. 



4. A vegetable cell with two rings formed in its interior. 



5. Another, with six rings. 



6. Four cells super-imposed, united to form a tube. 



7. Dotted ducts. 



8. A vegetable vessel with deposit formed on its interior in a spiral 



curve. 



9. Spiral vessels from leaf veins. 



0. A reticulated vessel. 



1. A scalariform duct. 



2. A double-pointed wood cell. 



3. A square-ended wood cell. 



4. A collection of same as tissue. 



5. A pitted cell from a deal shaving. 



6. A part of a single-pointed wood fibre. 



7. A branched wood fibre. 



8. A pointed ditto. 



9. A branched fibre from woody portion of a seed-coat. 



20. An oblong cell from skin of leaf. 



21. Two irregularly-shaped cells from skin of leaf 



22. Two irregularly-shaped cells from the skin of Cocciilus Iiidicus. 



23. A cell with wavy outline, from skin of leaf, under side. 



24. Kidney-shaped cells from skin of leaf forming a stoma. 



25. Same viewed in vertical section. 



