146 Dynamic Evolution 



then there should be a general relationship 

 between the amount of butter fat produced 

 and the ages of the dams. The answer to 

 that supposition is twofold. First, a general 

 relationship, if established in a mass, would 

 have small scientific standing as against a 

 series of individual measurements accurately 

 made and tested. Second, we are forced to 

 go to the Advanced Registry for official 

 records, and admission to the Advanced 

 Registry is on such a basis that an attempt 

 to show a relationship through butter fat 

 would, in many cases, indicate the facts to be 

 directly contrary to what they actually are. 

 To illustrate this last, let us assume two cows 

 in the Advanced Registry, each producing 

 milk having 13 per cent, of solids, — an ordi- 

 nary amount. One cow produces, in a week, 

 400 pounds of milk having 6 per cent, of fat 

 and 7 per cent, of proteids and sugar, and the 

 other cow produces 600 pounds of milk hav- 

 ing 3 per cent, of fat and 10 per cent, of pro- 

 teids and sugar. The first cow producing 24 

 pounds of butter fat in a week would stand 



