ANALOGY OF PLANT ORGANS. 69 



2. Bracts, when coloured — Darwinia, Salvia, etc. 



3. Peduncles — iri/acinfhus coutoaa. 



4. Calyx,— (1) by colour — Caltha ; (2) as food — Morus, 



5. Corolla, usually attractive by colour. 



6. Stamens — Thalidrum, Salix. 



7. Styles — Iridacete. 



8. Disk — Reseda. 



9. Fruits — Berries, etc. 



10. Seeds — Iris, Ahrus, Euonynitis, etc. 



YII. HONEY-SECEETING OkGANS. 



1. Stipules — Bean. 



2. Petiole — Acacia splicBrocephala, Primus, Pteris. 



3. Blade, — (1) apex — Nepenthes; (2) surface — Sarracenia. 



4. Bracts — Marcgravia. 



5. Calyx — Malpicjhia. 



6. Corolla — Aconitum, Helleborus, Ranunculus. 



7. Perianth — Lilium. 



8. Stamens — Viola, Penstemon, Stellar ia. 



9. Pistil — Arum. 



10. Eeceptacle, — 1 gland — Prunella; 2 glands — Vinca, CJieir- 

 anthus; 5 glands — Geranium; annular disk (hypogynous) 

 — Citrus Acer; (perigynous) — Rosacece; (epigynous) — 

 Caprifoliacece and Umhelliferce. 



In the foregoing paper I have endeavoured to give as concisely, 

 but as clearly as I could, the facts upon which homology and 

 analogy are based ; for I thought such data presented in a tabulated 

 form with references might be more useful to any one studying the 

 subject than if it were treated in a more popular and readable style, 

 but with less of detail. The inference, however, that may be 

 drawn from the natural-history point of view, is, the wonderful 

 adaptability of living matter to change its character in accordance 

 with requirements. The origin of species of both the Animal and 

 Vegetable Kingdoms depends upon this inherent property of proto- 

 plasm, though the actual causes which induce this "physical basis 

 of life " to effect Morphological Metamorphoses are still unknown 

 to us. 



