In 1788 occurred a severe drought in the summer, 5,000 horned cattle perishing for lack of water.[499] In 1791 there was a remarkable change of temperature in the middle of June, the thermometer in a few days falling from 75 deg. to 25 deg., and the hills of Kent and Surrey were covered with snow. We have now to deal with one of those landowners whose great example is one of the glories of English agriculture. Coke of Holkham began his great agricultural work about 1776 on an estate where, as old Lady Townshend said, 'all you will see will be one blade of grass and two rabbits fighting for that;' in fact it was little better than a rabbit warren. It has been said that all the wheat consumed in the county of Norfolk was at this time imported from abroad; but this is in direct contradiction to Young's assertion, already noted, that there were in 1767 great quantities of wheat besides other crops in the county. Coke's estate indeed seems to have been considerably behind many parts of the shire when he began his farming career.[500] When Coke came into his estate, in five leases which were about to expire the farms were held at 3s. 6d. an acre; and in the previous leases they had been 1s. 6d. an acre. We may judge of the quality of this land by comparing it with the average rent of 10s. which Young says prevailed at this time. With a view to remedy this state of things he studied the agriculture of other counties, and his observations thereon reveal a very poor kind of farming in many places: in Cheshire the rich pasture was wasted and the poor impoverished by sheer ignorance, in Yorkshire luxuriant grass was understocked, in Shropshire there were hardly any sheep; in his own part of Norfolk the usual rotation was three white straw crops and then broadcast turnips.[501] This Coke changed to two white crops and two years pasture, and he dug up and brought to the surface the rich marl which lay under the flint and sand, so that clover and grasses began to grow. So successful was he in this that in 1796 he cut nearly 400 tons of sainfoin from 104 acres of land previously valued at 12s. an acre. He increased his flock of sheep from 800 worthless animals with backs as narrow as rabbits, the description of the Norfolk sheep of the day, to 2,500 good Southdowns. Encouraged by the Duke of Bedford, another great agriculturist, he started a herd of North Devons, and, fattening two Devons against one Shorthorn, found the former weighed 140 stone, the latter 110, and the Shorthorn had eaten more food than the two Devons. However, a single experiment of this kind is not very conclusive.