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. Churn 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. 



