THE DAIRY 



191 



affected, but became more and more so as the practice of 

 milking at the more nearly equal intervals was prolonged. 

 Taking the figures for the last weeks of each period, the f ollo^r 

 ing are the results : 



The solids other than fat do not show this variation, but are 

 practically the same in evening's and morning's foilk. By 

 milking three cows at intervals of six hours for four successive 

 days the following average figures were obtained : 



The greater richness of the milk secreted during the day, and 

 the large secretion between 11 p.m. and 5 a.m., will be noted. 

 But it may be that the unequal intervals fifteen and nine hours 

 to which the cows had been long accustomed had some efiect 

 upon their manner of secretion, and that this influence affected 

 them for the four days of the experiment. 



It is well known that the first milk drawn from the udder at 

 milking time is very low in fat (sometimes 1-0, or even 0-5 per 

 cent, has been observed), while the last portion (" strippings ") 

 is very rich (sometimes up to 10 per cent. fat). The '' fore- 



