Sollas — On a Modification of SprengeVs Apparatus. 625 



avoided, and the chance of the liquid (which may be corrosive or 

 otherwise objectionable) entering the mouth is precluded. In 

 emptying, when powdered mineral is present, the apparatus should 

 be inverted in a small beaker of paraffin, and slightly inclined, so 

 that none of the powder may find its way into the second limb. 

 When all the powder is removed (and it falls out very rapidly), the 

 paraffin is drained out, and the tube washed, first with ether, and 

 finally with absolute alcohol. 



The apparatus has the advantage of being very easily con- 

 structed. A piece of soft glass tube of convenient length, and any 

 diameter, not too small nor too large (the operator can use his own 

 judgment, within somewhat wide limits), is softened at one end, 

 and enlarged into a funnel-shape (fig. 6), with a piece of hard, 

 conically-pointed charcoal. A glass thread is then fused on to the 

 edge of this, to enable the operator to draw out the narrow neck. 

 This done, the other end is then drawn out into a capillary (fig. 7). 

 The middle of the tube is next softened in a somewhat small blow- 

 pipe flame, drawn out, and at once bent, till the two halves of the 

 tube are brought into parallelism. The terminal capillary is then 

 bent into a position at right angles to the tube from which it pro- 

 ceeds, by holding a lighted lucifer-match under it, and allowing it 

 to bend under its own weight. The two limbs of the tube should 

 be sufficiently far apart to allow of their being cleaned on all 

 sides. 



