CONTENTS OF THE NOTES.

NotePage
1.[409].Horologe of Flora.
2.[410].Gravity and centrifugal force.
3.[411].Velocity of light.
4.[412].Velocity of falling bodies.
5.[412].Hydromancy.
6.[414].Coins and medals.
7.[421].Why bodies revolve on the shorter axis.
--[421].Vis inertiæ.
8.[422].Mechanical powers.
9.[423].Centre of gravity.
10.[423].The Indian blow-pipe.
11.[425].Springs.
12.[427].Elastic chairs and beds.
13.[428].Duck and drake.
14.[428].Vegetable elasticity.
15.[428].A simple orrery.
16.[429].Conic sections.
17.[429].Earthquake of Lisbon.
18.[429].Geology applied to agriculture.
19.[430].Buckland’s researches.
20.[436].The rifle.
21.[438].Centre of percussion.
22.[438].Spinning of the top.
23.[439].The mechanical powers.
24.[446].The cycloid.
25.[447].Billiards.
26.[448].Collision of bodies.
27.[450].Druidical remains.
28.[456].Animal suction.
29.[459].Accidental discoveries.
30.[461].Weight of the superincumbent ocean.
31.[462].Pecunia; its derivation.
32.[462].Cause of iridescence.
33.[463].Vegetable barometers.
34.[463].St. Swithin.
35.[464].The whale.
36.[465].Progressive motion in fishes.
37.[466].Flight of birds.
38.[466].Flight of insects.
39.[466].Obliquity of the wings of birds.
40.[467].A mechanical proposition.
41.[467].Kite messengers.
42.[467].Wind.
43.[470].Ancient archery.
44.[472].Sound conveyed by solids.
45.[473].Expressive music.
46.[473].Imaginary forms.
47.[474].Fairy rings.
48.[475].Resonance.
49.[477].Jew’s harp.
50.[478].Verbal telegraph.
51.[479].Electrical telegraph.
52.[479].Carrier pigeons.
53.[481].Origin of popular ceremonies.
54.[482].Chess.
55.[483].Arithmetical trick.
56.[484].A problem in algebra.