26 



AGRICULTURAL CHEMISTRY 



right amount at first rather than to pour back from the 

 receiving vessel. Replace the test-tube in the stand or 

 receiver on the desk ; then, before inserting the stopper, 

 touch it to the neck of the bottle to catch the few drops 

 on the edge, to prevent them from streaking down the 

 sides of the bottle, and on to the shelf. Be sure to replace 

 the bottle on the shelf in its proper place. Much an- 

 noyance and delay is caused by not returning the bottles 

 to their proper places. 



30. Filtering Place the funnel on the arm of the 

 wooden stand. Fold a filter-paper so as to make a semi- 



Fig. 



circle (see Figs. 



Fig. ii. Folded filter- 

 paper. 



12). Pour the 



Fig. 9. Fig. 10. 



Folding filter- paper. 



8 and 9). Fold the paper again, 

 forming a quadrant (Fig. 10) . Then 

 open it as shown in Fig. n. 

 Place the filter-paper in the funnel, 

 using a little water to make it ad- 

 here to the sides. Place a beaker 

 or cylinder under the funnel so as 

 to collect the filtrate, or liquid which 

 passes through the filter-paper (Fig. 

 material to be filtered into the filter- 



