CONTENTS. Xv 
E PAGE 
MrrzoroLogy—( Continued.) 
Of frost, : ; ‘ ae - . 3886 
Of fog, : : ‘ ; . 3886 
Of clouds, : g Y - 3888 
Of rain, : : : @ 291 
Of snow, : - a -o95 
Of hail, : : 2 . 396 
6. On the optical phenomena of the Srnigoshens : . &°a09 
Of twilight, : - . 40] 
Various (letreene of Sncipheee a aiden and reflection, . . 402 
On the rainbow, ; Os 
Of halos and parhelia, : : . : . 407 
Of the zodiacal hight, : - . : : « S410 
7. On the fiery phenomena of the air, . : . « #11 
8. Of the electric phenomena of the nnibephed : ° . 416 
Of lightning rods, , P : : ~ (420 
9. Of terrestrial magnetism, 5 : . 423 
CONTENTS OF THE PLATES (I. Nos. 16—29) 
TO 
PHYSICS AND METEOROLOGY. 
[Including the translation of German words and phrases in the same.] 
*, The references for explanations of the subjects are to the bottom paging of the text. 
PLATE 16. ae Fig. 24. Application of the same in the arc 
Parallel f forces, 179 steelyard, . ; : 283 
aerate yee 179 « 95. Lever of the second class, : » i BP 
Polygon of forces, 180 « 26. Lever of the third class, . 182 
Parallelopipedon of forces, 180| “ 27,28. Hlustrating the theory of 
5. Centre of gravity of a line, . 181 equilibrium, 184 
6. Do. do. triangle, 181| “ 29. Leverand pulley, . . . 183 
7. De: do. polygon, 181 « 30. Bent lever, : ‘ 5 , . 183 
8. Do. do. parallelogram, 181 “ 31. Compound lever, : : . 184 
ae Do. of irregular surfaces, 182 “ 32, 33. Wheel and axle, . 186 
10. Be  uotta cube, ; 181 ae renee screw attached to wind- 
wa: Do. d llelopipedon, 181 ass, - 190 
12. =o ae anata Pip 181 « 35. Wheel and axle with pulley, : 186 
13. Do. of two different “ 36-40. Movable pulleys, . oa .5¢ 87 
bodies, if 181, 182 “ 41, 42. White’s pulley, . wees, 188 
14. Illustrating Varignon’s funicular « 43. Pulley with cords working 
machine, . 182 obliquely, . . : . 188 
15, 16. Ill’g the theory of the pulley, 187| “ 44-46. Inclined plane, . . —-_ 188 
17, 18. Atwood’s machine for demon- 47, 48. The wedge, 183 
strating the laws of freely «49-52. Illustrating theory of strength 
falling bodies, _ 202 and stress of materials, . 495 
19. The fixed pulley, 187 
20. Illustrating the oscillation of the PLATE 17. 
pendulum, ‘ . 206 
21. The gridiron pendulum, 208 | Fig. 1-3. Illustrating the eee of the 
22. The mercurial pendulum, 208 screw, : F #S9 
23. Lever of the first class, 182 « 4. Hunter’s differential screw, . . 190 
