Part 22

Bessemer Steel, 104–108.

Birds, 172, 196, 197. (See Animals.)

Black Hole, 73.

Bond, Professor, 204.

Boston, Mass., 88, 132.

Bothkamp, observations at, 66.

Breadstuffs, 78, 79. (See Grain, Sun-spots, Wheat.)

Bridges, 20, 68.

Britain, Ancient, 1, 234. (See England.)

British Isles, 14, 25.

Brocken Spectre, 55.

Brothers, Mr., 50.

Bubbles, 168.

Buffer, the air as a, 216, 220.

Bunsen’s Researches, 12.

Burnham, W. S., 233.

Burning-glasses, 102–104.

Burning Heat, 160, 163.

Cactus, 14, 24.

Calcutta, 73.

California, 151, 180.

Cambric Needle (q. v.), experiment, 132.

Cambridge Observations, 227, 245–247.

Camera Obscura, 63.

Campanus Crater, 163, 165.

Candle, simile, 39.

Cannon-ball, 5, 38, 41, 98, 135, 186, 211.

Canopus, 234.