432 MR. J. B. LAWES, DR. GILBERT, AND DR. PUGH ON 
Page 
B, The Mineral Constituents added to the anaes ll. ptaweinenenmman Ae 
C. The Distilled Water ............ aetna MES 
D. The Pots used to receive the Bail, “Ah, “Plant, ‘Se. himenasinianeccaciainnes Seat 
E. Final preparation of the Soil, Ash, and Pot, for ie Plant ee me 
F. The Seeds taken for Experiment . SRL nineaienmninciomaeniniené Lhe —LD 
G. The Atmosphere supplied to the Biartis dao waiuinsieg 475—476 
H. The Apparatus used to enclose the ae and to o supply ene mith ‘Aly. Water, 
Carbonic acid, 0. ...cscseceeeeesseseeeee “i wmmincamvssays A76—478 
I. Use of the Apparatus ....... PITT AS—480 
J. The supply of Carbonic acid a ‘the: Plants .. dite ss¢  SOO—ASL 
K. Advantages of the Apparatus adopted... “0 sees 481—483 
L. Adaptation for healthy growth of the eoeilftions ey experiment adopted. sa dises 483—484 
Szotion II.—Other Conditions of Experiment requiring collateral Investigation :— 
Enumeration, of sccweisseias vee nvvoneswnswsnnwnawona vwenssnsion qwesteeanenmaananecenantas saeane 484 
A. General considerations in regard to the possible influence of Ozone on the 
supply of combined Nitrogen to ae PIB .jnisainsiei see gansiioon'cn wanes oan vans 484—486 
B. Composition of the Gas in Plants.. ey 486—495 
C. Experiments on the action of Ceantiel air on deeamposing Cea Matter, ‘and 
porous and alkaline substances ........0...cccccseceseeseceeeeeseneetecescaeeeseaseasens 495—497 
D. Evolution of free Nitrogen in the decomposition of Nitrogenous organic 
Mather rune vessenn genset owrensreeanee wee emaee ber nwe ene seude mma mulase sede mdepecmenamriads 497—508 
E. Experiments on the action of the oxidizing and reducing forces, as manifested 
in the decomposition of Nitrogenous orgamic matter .............eeseceeeeeseners 509—515 
F, The mutual relations of Gaseous Nitrogen, and the Nascent Hydrogen evolved 
during the decomposition of organic matter.........:.ccesceseeetecsseeee nse eeeseeeae 515—516 
Swnmary Statement of the Results of the consideration of the conditions required, or involved, in 
Experiments on the question of the assimilation of free Nitrogen by Plants .......cccscsesessens 516—517 
Szotion IITI.—Conditions of growth under which assimilation of Free Nitrogen by Plants is most 
likely to take place. Direct Kxperiments upon the Question under various cir- 
cumstances of growth :— 
A. General consideration of conditions of growth ......cccseccecseseeceecessveeveeseuens 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 the seed SOWN ..........ccssseccnnsceeceneesteseneseesences 521—529 
I. Experiments in which the plants had a known supply of combined Neko. 
gen, beyond that contained in the original seed .............ssceseenseseeeseeees 529—538 
Relations of the plants grown with an extraneous supply of combined nitrogen, 
to those grown Without it ......scssscessccsessssseeceseesttsteeceessseaereresssssens O89-—539 
Br LIGUUS,cadalytsoc ge iri va ec redeeming etinaammetere 589—540 
Summary of the Results of the whole [inquiry .....ccccccccsssesceccsnceccsesesescuscesuensecuuesesanscecuns 540—541 
APPENDIX. 
A. Preparation of solutions for manuring the plants, dates of application, and 
Quantities ApPPHEd 5: ..4.0ycondoerine ve wgebey Sasine eowen damusend eects lc¥eiaaancconiuesuns 542—543 
B, Taking up the plants, preparation for analysis, methods of analysis, &¢..........  543—547 
C. Abstract of the Records of Growth of the Plants. 
ST, NSA ene INE LSA xsd neigh ee ec eg ess is ooo Ss 548—558 
dike DAMS COW TE TB OR: ansemeiunsinamenacn seein nstavmmnnnromimmnennesawcsed CORTE 
Puatrs XII, XIII. XIV. and XV. 
