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   Lecture                                 grey = Comment text

 1 Int   |       vast an achievement as to lead his successor, Tyndall,
 2 I     |  effected by putting a piece of lead inside the lower part of
 3 I     |      there being those balls of lead hanging down on either side,
 4 I     |        side, in addition to the lead inside, I have lowered the
 5 I     |  another: here are two balls of lead, a very light one and a
 6 II    |      tobacco-pipe, fill it with lead, melt it, and then pour
 7 II    |       thus get a clean piece of lead (this is a better plan than
 8 II    | condition of the surface of the lead). I have here some pieces
 9 II    |        have here some pieces of lead which I melted this morning
10 II    |      clean. Now these pieces of lead hang together by the attraction
11 II    |        again; I have joined the lead together, not with solder,
12 II    |      way - it is just like back lead.) Now this charred straw,
13 III   |     forms. Now let me gradually lead your minds to a knowledge
14 III   |       vapors.~I am now going to lead you a step beyond this consideration
15 IV    |        oxygen. Well, a piece of lead will burn in oxygen just
16 IV    |        absolutely that piece of lead will act at once upon the
17 IV    |       did. And I will take some lead, and show you that it will
18 IV    |          These are the lumps of lead which you remember we had
19 IV    |         varnish by the oxide of lead, which is formed on the
20 IV    |         those scissors and that lead do not take fire while they
21 IV    |    lying on the table. Here the lead is in a lump, and the coating
22 IV    |     small glass tube containing lead pyrophorus21], the lead
23 IV    |         lead pyrophorus21], the lead has been very carefully
24 IV    |      broken at the end, and the lead poured out on to a piece
25 IV    |        fire.] Look! look at the lead burning! Why, it has set
26 IV    |     existing between very clean lead and the atmospheric oxygen;
27 IV    |       it was in the case of the lead by the oxide. But here is
28 IV(21)|                                 Lead pyrophorus. This is tartrate
29 IV(21)| pyrophorus. This is tartrate of lead which has been heated in
30 IV    |        effective in making that lead press on the table as it
31 IV    |     will remain there until the lead is removed; whereas, in
32 VI    |      that fine lead-tree25, the lead growing and growing by virtue
33 VI    |       virtue of this power. The lead and the zinc are combined
34 VI(25)|                                 Lead tree. To make a lead tree,
35 VI(25)|            Lead tree. To make a lead tree, pass a bundle of brass
36 VI(25)|       of a solution of sugar of lead, insert the wires and cork,
37 VI(25)|         short time the metallic lead will begin to crystallize