inverted Babcock cream test bottle, as shown in the illustration, and is 

 described as follows : Cm. 



Total length __ . 15.2 



Diameter (wide part) _. 3.0 



Diameter (neck)_-_ .__ 2.0 



Stem graduated to 5 cc and tenths ; 5 cc division line 5 mm below 



beginning of wide part. 



Ground area on w r ide part for use in numbering. Made of pine or 

 white wood. 



The tube is provided with a holder having the following dimensions : 



Cm. 

 Length 7.7 



Diameter 3.2 to 3.5 



Diameter of center hole, to lit stem _. _ 1.3 



/ 



=-1 



Tube. Holder. 



Apparatus for the determination of lead subacetate precipitate. 



The tube and holder constitute a couple and weigh together about 50 

 grams. They should be so constructed that when fitted together the 

 bottom end of the tube will be exactly even with the lower surface of 

 the holder. In order to prevent mixing the pieces belonging to a set, 

 each tube should bear a number corresponding with the number of its 

 holder. Also, in a set, each couple, i. e., tube and holder, should be 

 made to balance every other. There should be, as nearly as possible, a 

 balanced load carried at the circumference of the wheel of the centrifuge. 



CONDUCT OF DETERMINATION. 



Five cubic centimeters of sirup or 5 grams of sugar are introduced into 

 the tube, 10 cubic centimeters of water added, and the contents thor- 

 oughly mixed. Time is given in the case of sugar for complete solution. 



