MUST YOU KEEP A COW 77 



shall not say richness, but thickness. No matter 

 what its density, whether "table cream," "whip- 

 ping cream" or what, all store cream remains un- 

 changed in the bottle for an indeterminate time: 

 until it is used up or turns sour. Now you can 

 skim cream of different densities at home, in a 

 separator. But if you stow it in a bottle twelve 

 hours the cream will rise to the top, just as it does 

 on milk. There may be only a quarter of an inch 

 of milk in the bottom of the bottle, but there it 

 will be for all the world to see. Store cream never 

 does this; there is never any need to "shake before 

 using." What the dairies do to it, or say over it, 

 who can tell? 



Having decided that for the well-being of both 

 the farm and the family cows were essential, the 

 next thing was to settle on the kind of cows to 

 get. They should certainly be tuberculin- and 

 blood-tested. The cause of tuberculin-testing is 

 pretty well-advanced in Pennsylvania. Blood-test- 

 ing has not made the same progress, probably be- 

 cause its relationship to human health is not as 

 well-publicized. Both tests can be carried on under 

 state supervision, with indemnities from the state 

 and of course! from Washington for the destruc- 

 tion of reactors. 



The primary purpose of blood-testing is the 

 elimination of Bang's disease (chronic abortion) 

 in dairy cattle. (By the way: when a cow gives nor- 



