542 



MK. J. 13. LAWES, DE. GILBBET, AM; DE PUGB 



Appendix 



Ecccivcd subsequently to the reading of the paper. 



A. — Preparation of solutions for manuring the Plants, dates of application, 



and quantities applied. 



Sulphatc-of-Ammonia solution. — Ordinary ammonia-water was distilled from a flask, 

 the vapour condensed in a receiver containing pure distilled water, and the strength of 

 the solution determined by the volumetric method, by means of dilute sulphuric acid of 

 known strength, the preparation of which is described further on, at p. 545. A given 

 volume of the ammoniacal liquid thus prepared was neutralized by pure dilute sulphuric 

 acid, of which the quantity added was determined by measurement, and the strength of 

 the solution calculated accordingly. It was intended that each cubic centimetre should 

 supply about one-tenth of a milligramme of combined nitrogen. The exact strength of 

 the sulphate-of-ammonia solutions used in the course of the experiments was as under : — 



Table I. 



Tables II. and III. show the dates of the application of the above solutions to the 

 different plants, and the amounts of nitrogen so supplied. 



Table II. — Showing the supply of combined Nitrogen, as Sulphate-of- Ammonia solution, 



to plants grown in 1857. 



* A septem measure is that of 7 grains (=-ioVo °f a P°und avoirdupois) of water ; that is, rather less 

 than half a cubic centimetre, which is equal to 154323o grains (or 1 gramme) of water. 



