The carotene content of Palestinian fodder plants, vegetables and wild plants was determined. The examined fodder plants were: Egyptian clover, Fahli clover, lucerne, horse beans, field peas, vetch, oats, barley, cow peas, maize, pencillaria, Sudan grass and leaves of beetroots. The examined vegetables were: leaves of radish, mangold, sweet potato, spinach, cauliflower, parsley, lettuce, kohlrabi, onion and cabbage. The wild plants examined were: nettle, mallow and portulaca.

A suitable method of fluorimetric determination of riboflavin was developed, and riboflavin in various poultry feeding stuffs was determined by its use.

Riboflavin was determined in fodder plants, vegetable refuse and wild plants. The influence of seasonal changes and of different stages of growth on the riboflavin content in fodder plants was investigated. Summer-grown plants contain more riboflavin than those grown in the rainy winter season. The riboflavin content of the plants declines in the course of their growth.

The nutrition of the carrot in a light gravel soil of known analysis with high available phosphate has been studied by statistical pot-culture methods, and the responses, linear and curvature components, etc., due to nitrogen, phosphate, and potash, have been calculated.

No hard and fast rule can be made as to the adequacy or otherwise of any particular fertilizer in a soil, as the different parts of the plant (top and root) were shown to be capable of responding quite differently to that fertilizer.

1. Clover sickness caused by Sclerotinia Trifoliorum is widely distributed in the American continent and western Europe; and in Britain it is often of considerable importance, especially in parts of East Anglia and Yorkshire. The severity of the disease is dependent upon the season, and in some countries very severe financial loss may result.

2. Most of the commonly grown legumes are subject to the disease, but they vary in their susceptibility. Peas affected with the disease have not been observed in the field although they succumb to artificial inoculation.

Repeated attempts have been made, both during the recent war and the war of 1914–18, to make the store of starch and other nutrients in the horse-chestnut available for farm animals. Unfortunately, the extremely bitter taste of the horse-chestnut, due to the presence of saponins and, to a smaller extent, of tannins, has proved a severe obstacle, and horse-chestnuts have been found to be an unsuitable food for livestock both on account of their unpalatable character and their constipating action.

Two large-scale feeding trials have been carried out with the object of testing the validity of findings from pig digestion trials in respect of the nutritive value of horse-chestnut residue (a by-product of the manufacture of saponin and glucose from horse-chestnuts); and of alcohol-extracted and water-extracted horse-chestnut meals.

Trial I. The horse-chestnut residue was fed in two separate periods, the first from 50 to 100 lb. live weight, when the residue constituted 20 % of the total ration, and the second from 190 lb. to slaughter weight, when the allowance was increased to 30%. In both periods the residue replaced an equal percentage of ground oats in the control ration.

A convenient method of introducing into a field experiment additional factors which can be applied to smaller areas than that of the whole plots is to use split plots: each whole plot is split into sections, and the different combinations of the additional factors are randomized over each set of sub-plots. An extension of this idea is the device of split-plot confounding, by which not all the combinations of the additional factors are used in every whole plot; instead, the possible combinations are subdivided into two or more sets which are then assigned to blocks and whole-plot treatments in a balanced manner, in such a way as to confound certain interactions of the additional factors between whole plots and certain higher order interactions between blocks.

The device of split-plot confounding for introducing additional factors into a field experiment can only give a balanced design when the number of whole plots per block and the number of replications of each whole-plot treatment are multiples of the number of sub-sets into which the combinations of the additional factors are divided. When this condition is not satisfied it may still be possible to arrange that the design shall be partially or nearly balanced in such a way as to be useful in practice and to require a reasonably simple statistical analysis. Nevertheless, the experimenter should always bear in mind the desirability of balance, and should have recourse to unbalanced designs only when the exigencies of space or material, or an unforeseen necessity of introducing extra factors during the course of an experiment, leave him with no alternative. No attempt has been made to give a comprehensive account of designs of this kind, but the numerical analysis of the yields from a typical experiment has been discussed in detail. Though the lack of balance leads to some non-orthogonality of treatment contrasts, the more important comparisons can usually be satisfactorily estimated. The details of this estimation vary from one experiment to another, but the example given should make the principles clear to those who are familiar with the analysis of variance. I am indebted to Dr E. M. Crowther and to the Agricultural Research Council for permission to use the numerical results discussed in this paper