19-20.] 



AGBICrLTTT.E AbEOAD. 



779 



ing series depicting the embryology of the egg. A film entitled 

 *' The Constrnction of a Wooden Hoop Silo " shows in fifteen 

 minutes an operation that would require a full day to demon- 

 strate if the class were taken to a farm where such » 

 building was in progress. An excellent film, devised as a 

 pleasant story, has been prepared as an auxiliary to the promo- 

 tion of rural industries. While it imparts instruction, this 

 film introduces the personal element, and so maintains the 

 kinship of the cinema with recreation. The picture is entitled 

 " The Home Demonstration Agent " — a United States official 

 whose duty corresponds to that of one of the county organisers 

 in domestic science in this country. This lady's work among 

 women and girls in outlying countiy districts is faithfully 

 traced, and its effects on the whole community are brought 

 home to the audience. The little drama introduces the work 

 of the egg-circle, the communal kitchen, the county encamp- 

 ment and picnic, and the exhibition of club work at the county 

 fair. 



^ * * * * * 



The large development of the milk trade, and also the estab- 

 lishment of butter factories and creameries, call for great care 

 in ensuring that the milk purchased or 



The Hoyberg quaHty. The 



Process oi Testing ^^^.^^^.^^^^ non-fatty soHds in milk is 



^^^of Milk^^^^^^ ^^^^ constant, but the fat or cream con- 

 tent varies, and it is necessary for tests to 

 tr ■ m time to time to determine whether the amount 

 01 la: m the milk is or is not below the ** standard." 

 Such tests are commonly made with an apparatus known 

 as the butyi-ometer, invented by Dr. Gerber. This 

 apparatus consists of a number of test tubes in which the 

 milk can be specially treated for testing. Definite quantities 

 of milk and acid are mixed in a specially constructed test tube, 

 and the tube is rotated at high speed. The fat is in this way 

 separated from the remainder of the milk, and driven mto a 

 narrow tube graduated so as to enable the percentage of fat 

 contained in the sample to be measured. 



A method of testing the fat content of milk on somewhat 

 similar lines has recently been designed by Mr. Hoyberg, 

 Veterinary Officer to the Commune of Frederiksberg, Copen- 

 hagen, and has attracted some attention in dairy circles. 

 Ot^rvations on this process have been made by three 



