In many collections, we are of opinion, too little air is usually admitted in the green-house; especially in winter, and early spring: and we are also of opinion, that where we have seen the most given, the plants are the most healthy and robust. The fine collection at Mr. Hibbert’s is a powerful argument in favour of this theory.--In few places is air so freely given; in none are plants in finer health: therefore much air is essentially necessary; for plants, like animals, are now known to absorb from the atmosphere, through a process analogous to respiration, its oxygenous particles; thence deriving strength and vigour, and without which no animal or vegetable can at all maintain either health or life. Our figure was made from the Clapham Collection last June. The plant is shrubby, erect, and is propagated by cuttings in the usual way. [Illustration] PLATE CCCCXXX. RICINUS ARMATUS. _Prickly-capsuled Ricinus._ CLASS XXI. ORDER VIII. _MONOECIA MONADELPHIA._ One House. One Brotherhood. ESSENTIAL GENERIC CHARACTER. MAS. Calyx 5-partitus. Corolla 0. Stamina numerosa. FEMINA. Calyx 3-partitus. Corolla 0. Pistilli 3, bifidi. Capsula 3-locularis. Semen 1. MALE. Empalement 5-parted. Blossom none Chives numerous. FEMALE. Empalement 3-parted. Blossom none. Pointals 3, 2-cleft. Capsule 3-celled. Seed one. SPECIFIC CHARACTER. RICINUS, foliis peltatis alte palmato-novem-fidis serratis, petiolis glandulosis, capsulis undique spinis herbaceis. RICINUS, with leaves peltated deeply palmate-9-cleft and serrated, with glandulose petioles, and capsules every where furnished with herbaceous spines. REFERENCE TO THE PLATE. 1. A male flower. 2. The male empalement. 3. The pointals. 4. A capsule. 5. A seed.