Xll. 
Charles Austin Gardner. 
VIII, Epharmosis and Growth-forms 
1. Trees and Shrubs 
2. Lianes .... 
3. Herbs .... 
Ivii. 
Iviii. 
Ixi. 
Ixii. 
IX. Climatic Tables — 
Table I. — Mean Monthly and Annual Precipitation in Points 
(100 points ^ one inch) .... .... .... .... Ixvi. 
Table II. — Annual and Seasonal Rainfall Tables, showing 
Rainfall for the four consecutive wettest months, the four 
consecutive driest months, the percentage of the four 
wettest months, and the Annual Rainfall Variation ex- 
pressed as a percentage of the annual rainfall .... .... Ixix. 
Table III. — Relative Humidity — Mean Monthly Readings for 
9’0 a.m. and 3*0 p.m. .... .... .... .... . .. Ixxii. 
Table IV. — Saturation Deficit — Mean Monthly Averages for 
9*0 a.m. Ixxiii. 
Table V. — -Climatic Statistics of Rainfall and Temperature, 
Saturation Deficit, etc. .... .. . .... . .. .... Ixxv. 
X. Maps — ■ 
Plate I. — Summer Rainfall — November to April — Isohyets 
in inches) .... .... .... .... .... Ixxvi. 
Plate II. — ^Winter Rainfall — May to October — -(Isohyets 
in inches) .... .... .... .... .... Ixxvii. 
Plate III. — ^Normal Mean Temperature — Isotherms in ° F. 
for January .... .... .... .... .... Ixxviii. 
Plate IV. — Normal Mean Temperature — Isotherms in ° F. 
for July .... .... .... .... .... Ixxix. 
Plate V. — Rainfall Variabihty — Variation from the Mean, 
expressed as per cent. .... .... .... Ixxx. 
Plate VI. — The Meyer Ratio .... .... .... .... Ixxxi. 
Seasonal Precipitation ^ 
Plate VII.— The " Ratio . Ixxxii. 
Seasonal Saturation Deficit 
_ _ Seasonal Precipitation ^ 
Plate VIII. — The Ratio .... .. . Ixxxm. 
Seasonal Temperature 
Plate IX. — The Three Provinces of Vegetation and Climate Ixxxv. 
Plate X. — The Phytogeographical Formations .... .... Ixxxvii. 
I. INTRODUCTION. 
The geographical distribution of plants and the study of plant habitats 
is one of the most interesting aspects of modern botany, and of the countries 
of the world, few are more favourably situated for this study and its bearing 
on questions of evolutionary history than Western Australia. In few countries 
has the ecological aspect been of such general application for, in the general 
mosaic of its soil types, the use of plants as indicators of the soil has been 
recognised from the eai’liest days of our history as criteria in the selection 
of land for agricultural purposes. 
