HISTORICAL 



23 



show the great interest taken in dairy work. The problem of 

 supplying milk to the city of London, with a population of 1,079,000 



Fig. 4. — Churn operated by foot power (Benno Martiny). 



in 1801, was solved by keeping a large number of cows within the 

 city. Transportation in those times was too slow for the milk 



Fig. 5. — Cliurii operated by dog in treadmill (Benno Martiny). 



business and the surrounding country could not furnish a satis- 

 factory quantity of milk. About one-third of the total supply 

 was derived from city cows. 



