18 
The direction of the earthquake is indicated by the quarter of the 
compass towards which the affected leaf points. da 
chlagwetter position resembles the above position except that 
the leafrachis is not bent sharply from the pulvinus, but at first is 
directed upwards a short distance, and the distal two-thirds curved 
sharply downwards. The forecast is drawn from it in much the same 
manner as for earthquakes. It is a significant fact that leaves after 
assuming the * Schlagwetter" and earthquake position, do not 
straighten out again, but always die. This will be referred to 
later on. 
In addition to the strongly marked positions just described a little 
observation shows that each leaf is continually oscillating slowly on its 
extent. In a single day I have known a leaf to move through as large 
an angle as 20°— 25°. During his stay at Kew, Mr. Nowack elaborated 
eyclones. From day to day he sketched out and placed in my hands 
synoptic charts of barometric high and low pressure for, generally 
weather reports. Mr. Nowack claims that from these charts forecasts 
i ad. 
at the Meteorological Office. : 
criticism, as Mr. R. H. Scott, the secretary to the Meteorological Office, 
t may, however, be of interest to explain briefly the general method 
by which these charts were prepared. 
As already mentioned barometric readings are taken solely from the 
inclination of the leaf-rachis to the stem i 
one high pressure. The degree of pressure is indicated by the angle 
made by the rachis with the horizontal. Thus, i 
pointing obliquely upwards, if it makes an angle of 45? with the hori- 
zontal, a considerable depression is indieated at a certain distance in the 
direction in which the leaf points ; on the other hand, if the leaf- 
rachis makes only an angle of 18? with the horizontal, a much less 
marked point of depression is indicated. 
Similarly, as regards high-pressures, except that ihe leaf rachis 
points downwards instead of upwards, the further the leaf is from the 
horizontal the greater the pressure indieated. 
As with the weather Prognosties, so here also, leaves of different 
ages indicate for different distances from the point of observation. 
inclinations are marked 1, 2, 3 up to 6, high or low pressure, according 
to the deviation from the horizontal 1 high or 1 low being the 
