166 THE ANTARCTIC MANUAL, 
more than 1° C. in a minute, and falling again as much. The ther- 
mometers in the screens were also a good deal affected, though not 
nearly to the same extent as the freely exposed ones. The recording 
instruments, the clock motion of which was not sufficiently quick to 
draw the record out into an indented line, showed a broad band 
which measured the amplitude of the excursions of the instrument, 
though by no means the amplitude of the oscillations of the tem- 
perature of the air. This phenomenon was particularly observed on 
the 8th July, 1893. It was very warm, as the following observations 
of the thermometers in the large observatory screens will show :— 
Taste XXIII. 
Hour. 9 a.m. 10 a.m. Noon. 2p.m. 4p.m, 
Dry bulb (°C.) 20°1 22°4 24°9 23°8 18°9 
Wet bulb (°C.) . Z Vet 17°3 18°2 17°7 16°6 
Vapour tension (mm.) BY ce 13°5 11°5 11:5 11°3 12°6 
Relative humidity. . F 3 77 58 49 52 77 
“Tt was during the heat of the day, from 10 a.m. to 2 p.m., that 
the hot puffs made themselves most felt ; but I found it impossible 
to measure their temperature, owing to the thermal inertia of the 
thermometers. The puffs lasted not longer than one or two seconds, 
and their temperature, to judge by the sensation, was rather higher 
than that of the body. The thermometers had only begun to rise 
when the heating ceased, and they fell back again. From the figures 
in the above table, it will be seen that the temperature of the 
air at noon reached 24°9°C., a very high figure for a station in 
nearly 57° north latitude. Along with the great rise of tempera- 
ture there is a fall of absolute as well as of relative humidity, 
indicating that the air has come from a greater altitude. Attempts 
to measure the actual temperatures of the hot puffs gave no 
satisfactory result.” 
These few lines will give an idea of the nature of the weather 
called Kohn, The temperature of the air is abnormally high, and it 
is very unequally distributed through the mass of the air. The 
atmosphere seems rather to be made up of sheets of air of very 
different temperature ; it is also very dry. 
In the Antarctic regions there are plenty of high mountains and 
sharp gradients, and it is certain that conditions described as 
characterising Féhn must occur in some localities under certain 
meteorological conditions. Drygalski has called attention to the 
