N.

Nephoscope, [41]-[43].

O.

Observational meteorology, problems in, [125]-[141].
Observations, advanced instrumental, [26]-[46].
Observations, cloud, [5], [9], [41]-[43].
—— elementary instrumental, [11]-[26].
Observations, non-instrumental, [1]-[10].
Observations, rainfall, [9], [10], [26].
—— state of sky, [5], [9].
—— temperature, [1]-[3], [25].
—— wind, [3]-[5], [8], [9], [25].

P.

Pampero, [76], [104].
Pascal, [21].
Precipitation, [7], [9], [10], [138], [139].
Pressure and wind direction, [91]-[93].
—— and wind velocity, [93]-[96].
—— atmospheric, [19]-[21].
—— charts, [76]-[83].
—— cyclonic variation of, [140], [141].
—— decrease with altitude, [139], [140].
—— diurnal variation of, [140], [141].
—— gradient, [82]-[85].
Prevailing westerly winds, [93], [95], [96], [112], [113].
Psychrometer, [28].
—— sling, [31].
Purga, [75].

R.

Rain, see Precipitation.
—— heavy, [138], [139].
—— gauge, [15]-[17].
Rainfall records, [17], [18], [26].

S.

Sensible temperatures, [29], [30].
Sirocco, [103], [104], [133], [134].
Sling psychrometer, [31].
Smudges, [135].
State of sky, [5], [9], [45].
Suggestions to teachers, [171].