76 AGRICULTURAL EXPERIMENT STATION. 



turning gently down the side hot dilute acid in sufficient quantity 

 to fill the bottle to about the 34 mark. The fat usually rises 

 and forms a compact column in two or three minutes so that by 

 the time the 10th or 12th bottle is put into the warm water, 

 the first can be read, giving directly the per cent, of fat. 



The dilute acid consists of one part by volume of strong 

 acid to one part of water. In mixing, the water must always be 

 put in the vessel first and the acid turned into it. If used imme- 

 diately it will need no extra heating, as sufficient heat is developed 

 in the mixing. We have only had opportunity to make 12 or 

 15 tests with this bottle, but they seem to indicate that it is accu- 

 rate as can be seen by the table below. 



One cannot work quite as rapidly as with bottle No. 3 there- 

 fore we would advise its use only on very rich cream containing 

 over 25 per cent, of fat. 



This form of bottle (No. 3.) can be used in the regular size 

 machine. 



Where To Obtain The Apparatus. 



Arrangements have been made with Cornish, Curtis & Greene, 

 Fort Atkinson, Wis., manufacturers of the milk test apparatus, to 

 furnish the modified apparatus to parties who may desire it at 

 about the same price as the ordinary form. 



Parties ordering the cream tester, must be particular to mention 

 what they want or otherwise they may receive the wrong machine. 

 Any of the pieces of glass-ware can be obtained of Emil Greiner, 

 N. Y., and should be ordered by number, then no mistake can be 

 made. 



Cream Test bottle No. 1 is for use in the regular size milk test- 

 ing machine and reads to 23 per cent. 



Cream Test bottle No. 2 is for use in the machine especially 

 made for the purpose and reads to 25 per cent. 



Cream Test bottle No. 3, is for testing rich cream, can be used 

 in either machine and reads to 35 per cent. 



Sulphuric acid can be obtained of wholesale druggists, or dealers 

 in chemicals. The Cochrane Chemical Co., Boston, Mass., sells 

 commercial acid, specific gravity, 1.835, in carboy lots at very 

 reasonable prices. Acid of this strength should be slightly diluted 

 by adding about twenty parts of acid to one part of water by 

 volume. 



