The reduc-tion in annual species achieved by the intensive fallow of 1926-29 has on the whole been maintained, that of Papaver rhoeas being the outstanding example, though since 1953 there have been signs of the return of this weed. Alopecurus myosuroides, another principal weed has only been temporarily checked by the once in five-year fallow and has quickly re-established itself, though less noticeably so since 1953. Other species have become much more plentiful, e.g. Ranunculus arvensis, Vicia sativa and Avena spp., though the latter has now been gradually eliminated by hand-pulling. Germination results from soil samples agree remarkably well with field rating records, but comparison is limited to the species prevalent on the plots selected for sampling. Unfortunately no germination data are available for the period 1946-1954 when considerable changes in weed flora took place. Perennials were unimportant in 1930. Of the species then present Sonchus arvensis has failed to return, but Cirsium arvense has once more become a serious weed, chiefly since 1943. Convolvulus arvensis is also re-established but Tussilago farfara and Equisetum remain relatively unimportant and of local occurrence only.