(p. 84) Owing to the presence of 'furfuroids' in large proportion as constituents of the tissues of the stems of cereals, these plants afford convenient material for studying the problem of the constitution of the tissue-furfuroids, as well as their relationship to the normal celluloses. The growing barley plant was investigated at successive periods of growth. Yield of furfural was estimated on the whole plant and on the residue from a treatment with alkaline and acid solvents in the cold such as to remove all cell contents. This residue is described as 'permanent tissue.' The observations were carried out through two growing seasons--1894-5--which were very different in character, the former being rainy with low temperature, the latter being abnormal in the opposite direction, i.e. minimum rainfall and maximum sunshine. The barley selected for observation was that of two experimental plots of the Royal Agricultural Society's farm, one (No. 1) remaining permanently unmanured, and showing minimum yield, the other (No. 6) receiving such fertilising treatment as to give maximum yields. The numerical results are given in the annexed tables: Table Headings: A: Date B: Age of Crop C: Plot D: Dry Weight E: Furfural p.ct. of dry weight (a) F: Permanent tissue p.ct. dry weight G: Furfural from permanent tissue H: P.ct. of tissue I: P.ct. of entire plant J: Ratio a : c BARLEY CROP, WOBURN, 1894. ________________________________________________________________________ | | | | | | | | | | | | | | | | [G] | | | | | | | | |_____________| | | | | | | | | | | | | [A] | [B] | [C] | [D] | [E] | [F] | [H] | [I] | [J] | |_________|__________|_____|______|______|______|______|______|__________| | | | | | | | | | | | May 7 | 6 weeks | 1 | 19.4 | 7.0 | 53.4 | 12.7 | 6.8 | 1.03 : 1 | | | | 6 | 14.7 | 7.0 | 55.9 | 10.3 | 5.7 | 1.23 : 1 | | June 4 | 10 weeks | 1 | 17.6 | 7.7 | 52.9 | 11.6 | 6.1 | 1.26 : 1 | | | | 6 | 13.5 | 8.1 | 58.5 | 13.4 | 7.8 | 1.04 : 1 | | July 10 | 15 weeks | 1 | 42.0 | 9.0 | 65.7 | 9.8 | 6.4 | 1.40 : 1 | | | | 6 | 32.9 | 10.6 | 65.7 | 12.5 | 8.2 | 1.30 : 1 | | Cut | 21 weeks | 1 | 64.0 | 11.9 | 70.0 | 14.5 | 10.1 | 1.18 : 1 | | Aug. 21 | | 6 | 64.6 | 13.4 | 70.5 | 15.0 | 10.6 | 1.26 : 1 | | Carried | 22 weeks | 1 | 84.0 | 12.7 | 75.0 | 16.5 | 12.4 | 1.02 : 1 | | Aug. 31 | | 6 | 86.4 | 12.4 | 78.4 | 15.1 | 11.8 | 1.05 : 1 | | | | BARLEY CROP, WOBURN, 1895. | | |