" FRESHWATER CHALK " AT HALSTEAD. 215 material for dressing the land for agricultural purposes. Being very soft and powdery it would act much more beneficially and rapidly than chalk in Boulder-clay ; be much cheaper to cart since a smaller quantity would be required, it being nearly pure chalk instead of a mixture of chalk and clay, and lastly it would be a better dressing where the clay of the Boulder-clay is prejudicial to the land. APPENDIX. Percentage Composition of Chalk.