A system of dairy farming by which cows were moved to higher pastures for the summer was once in general use in Cornwall. A visitor to the parish of Constantine in the 1750s described this method: some 10 or 20 cows would be let by their owner to another man at the rate of 48 shillings per cow per year. The latter would find summer pasture for the cows and bring them back at Michaelmas. The place-names "gwavas" and "laity" are evidence of this system since the former means "winter-house" and the later "milk-house" or "dairy". When the herds had been moved to their moorland pastures for the summer the main work would be dairying. There are advertisements for such summer pastures in the "West Briton" in the early 19th century. G. B. Worgan (1808) gives the prices charged by these herdsmen: from 2s. to 21s. for neat cattle and from 1s. to 3s. per score of sheep.