〃 4. Leaf of wood-anemone with its cluster-cups (_Æcidium leucospermum_). 〃 5. Portion of same, slightly magnified. 〃 6. Anemone cluster-cups, further magnified. 〃 7. Leaf of Berberry with cluster-cups (_Æcidium Berberidis_). 〃 8. Cluster of cups from the Berberry, as seen with a lens. 〃 9. Cluster-cups of Berberry, magnified. 〃 10. Nettle-stem distorted by growth of cluster-cups (_Æcidium Urticæ_). 〃 11. Nettle cluster-cups, magnified. II. 12. Leaf of Pilewort with groups of cluster-cups (_Æcidium Ranunculacearum_). 〃 13. Group of cluster-cups from Pilewort, as seen with a lens. 〃 14. Section of Pilewort cluster-cups, magnified. 〃 15. Bedstraw cluster-cups (_Æcidium Galii_) on the Great Hedge Bedstraw. 〃 16. Tip of leaflet with cluster of cups, viewed through a lens. 〃 17. Bedstraw cluster-cup from same, magnified. 〃 18. Leaflets of Mountain-ash with horn-shaped cluster-cups (_Rœstelia cornuta_). 〃 19. Group of Mountain-ash cluster-cups, magnified. 〃 20. Pear-leaf with its cluster-cups (_Rœstelia cancellata_). 〃 21. Cluster-cup from the same, magnified. 〃 22. Leaves and fruit of Hawthorn with lacerated cluster-cups (_Rœstelia lacerata_). 〃 23. Elongated cells forming the walls of the cluster-cups, × 250. 〃 24. Single cell, more highly magnified, with its parallel striæ. 〃 25. Cluster-cups from fruit of Hawthorn, magnified. 〃 26. Section of same, further magnified. 〃 27. Fir-leaves bearing cluster-cups (_Peridermium Pini_). 〃 28. Isolated cup of same, magnified. III. 29. Many-jointed fruit of Burnet chain-brand (_Xenodochus carbonarius_), magnified. 〃 30. Leaflets of Burnet with rust on the lower, and brand (_Aregma acuminatum_) on the upper leaflets. 〃 31. Spores of Burnet rust (_Lecythea Poterii_) × 230. 〃 32. Fruit of Burnet brand (_Aregma acuminatum_). 〃 33. Leaf of Barren Strawberry with rust and brand intermixed. 〃 34. Spores of Barren Strawberry rust × 230. 〃 35. Fruit of Strawberry brand (_Aregma obtusatum_) × 300. 〃 36. Leaflet of Rose with its rust and brand intermixed. 〃 37. Spores of Rose rust (_Lecythea Rosæ_) × 230. 〃 38. Fruit of Rose brand (_Aregma mucronatum_) × 300.