122 BUTTER-MAKING. 
milk, and cause bad flavors. In most of the creameries the 
exhaust-steam from the engine is used to heat the water for the 
boiler. This steam is likely to carry with it cylinder-oil, which 
will impart undesirable flavors to the butter. Some creameries 
are also using boiler compounds for the removal of scales. 
These, when subjected to high heat and pressure, are likely 
to be transmitted to the steam-pipes, and from there with the 
steam into the milk. The scale and rust of steam-pipes are 
also likely to be transferred to the milk. 
The right way to heat milk previous to skimming is to make 
use of one of the special heaters on the market, which heat 
by the use of steam or hot water indirectly. 
