432 MR. J. B. LAWBS, D% BXEBERJ, AOT DB. I'L'-li OR 



Page 



B. The Mineral Constituents added to the prepared soil l~- 



C. The Distilled Water 478 



D. The I' i a i d to receive the Boil, Ajfo, Plant, <^i- 47:j — 174 



E. Final preparation of the Soil, Ash, and Pot, for the riant 171 



F. The Si r,l, taken t'.ir i: |" i miiiiiI 471 — 175 



G. The Aim- ipplied to the Plants 475 — 170 



H. The Apparatus used to enclose tin' Plants, and to supply them with Air, \\'ut< r, 



Carbonic acid, &c 476 — 17^ 



I. Use of the Apparatus 478—480 



J. The supply of Carbonic acid to the Plants 480—1-1 



K. Advantage ■- of the Apparatus adopted 481 — b83 



L. Adaptation for healthy growth of the conditions of experiment adopted 483 — 1: 1 



Section II. — Other Conditions of Experiment requiring collateral Investigation: — 



Enumeration of 184 



A. General considerations in regard to the possible influence of Ozone on the 



supply of combined Nitrogen to growing Plants 1^ I — l-'I 



B. Composition of the Gas in Plants 4S6 — Tj-'j 



C. Experiments on the action of Ozonized air on decomposing Organic Matter, and 



porous and alkaline substances 493 — 407 



D. Evolution of free Nitrogen in the decomposition of Nitrogenous organic 



matter 497—" 



E. Experiments on the action of tbe oxidizing and reducing forces, as manifested 



in the decomposition of Nitrogenous organicmatter 509 — 515 



E. Tbe mutual relations of Gaseous Nitrogen, and the Nascent Hydrogen evolved 



during the decomposition of organic matter 515 — 516 



Summary Statement of the Results of the consideration of the conditions required, or involved, in 



Experiments on the question of the assimilation of free Nitrogen ly Plants 516 — 517 



Section III. — Conditions of growth under which assimilation of Free Nitrogen by Plants is most 

 likely to take place. Direct Experiments upon the Question under various cir- 

 cumstances of growth : — 



A. General consideration of conditions of growth ■ 517 — 520 



B. Direct experiments on the question of the assimilation of free Nitrogen by plants 520 — 540 



I. Experiments in which the plants had no other supply of combined Nitrogen 



than that contained in tbe seed sown 521 — 529 



II. Experiments in which tbe plants had a known supply of combined Nitro- 



gen, beyond that contained in the original seed 529 — 53S 



Eelations of the plants grown with an extraneous supply of combined nitrogen, 



to those grown without it 538 — 539 



Conclusions 539 — 540 



Summary of the Results of the ichole Inquiry 540—541 



Appendix. 



A. Preparation of solutions for manuring tbe plants, dates of application, and 



quantities applied 542 — 543 



B. Taking up tbe plants, preparation for analysis, methods of analysis, &c 543 — 547 



C. Abstract of the Eecords of Growtb of tbe Plants. 



I. Plants grown in 1857 54S— 558 



II. Plants grown in 1858 55S— 577 



Plates XII. XIII. XIT. and XT. 



