34 AQUATIC MICROSCOPY FOR BEGINNERS. 



posit at the bottom of a conical glass vessel with a 

 quart of water above it, and who, after running about 

 for bottles and jars to hold this water, which he thought ■ 

 must be poured off, returned to find the deposit re- 

 moved, and in a small phial in my pocket, the quart of 

 water remaining undisturbed. "Why," he said, "that 

 is strange. I never saw the like. How did you do 

 it?" 



It is often convenient to have several dipping-tubes, 

 some straight, others drawn out to a point, and some 

 curved so as to be readily directed -into a narrow cor- 

 ner. A glass tube is easily pulled out to a fine ex- 

 tremity or variously curved, when softened in an alco- 

 hol flame. But a spirit-lamp may not always be with- 

 in reach, and is not necessary, for the student can 

 make a Bunsen burner almost without cost, and use it 

 successfully if his home is supplied with illuminating 

 gas. Prof. Austin C. Apgar, in Science News and Bos- 

 ton Journal of Chemistry, has, under the title "A Bun- 

 sen burner for two cents," recently described a simple 

 piece of apparatus that is a boon to any one desiring 

 to do a little amateur glass-blowing. A strip of tin 

 about six inches long and two wide is rolled, without 

 solder or fastening of any kind, into a tube about half 

 an inch in diameter, after two holes, each about one- 

 fourth inch in diameter, have been punched so that 

 they shall be on opposite sides of the tube, and high 

 enough to be a short distance above the tip of the gas- 

 burner. This simple arrangement is forced over the 

 ordinary burner, so that the holes are just above the 

 tip, the elasticity of the tube holding it in place; the 

 gas is lighted at the upper end, where it burns without 

 smoke and. gives a strong heat, the 'flame being. easily 



