of northern Arizona, [18];

linked with flora, [349], [350], [358].

Flagstaff, Arizona, [16].

Flammarion, [21], [23], [202].

Flora, [361];

linked with fauna, [349], [350], [358];

fixtures, [360].

Focal length, of objective in photographing canals, [275].

Franz Joseph Land, [45].

Frosts, first arctic, [299], [300], [345];