Capri, blue grotto of, [257], [258].

Capture, river, [175], [176], [179].

Carbonization, [151].

Cascade Mountains, fissure eruptions of, [102].

Cascade stairway, [376].

Caspian Depression, [14].

Cauliflower cloud, [130].

Caverns, galleries directed by joints, [182];

of limestone, [182], [195];

refuge of predatory animals, [185].