CONTENTS, 
Page. 
I.— History of the Botanical Exploration of Aden ..... 1 
II. — Physical Aspects of Aden ........ 24 
1. Area and Position ........ 24 
2. Geology .......... 24 
3. Topography 28 
4. Conditions of Plant-Life ....... 30 
(a) Soil 30 
(5) Eain 32 
(c) Humidity and Temperature ...... 34 
III, — The Vegetal ion 39 
1. Statistical account ........ 89 
2. General aspects ......... 51 
(a) Peninsula of Aden . . . . , . 51 
(5) Little Aden ........ 56 
3. Adaptation ......... 57 
4. Flowering season and climate ...... 60 
5. Plants and Animals ........ 6i 
6. Colour of Flowers . , . . , . . t 62 
7. Geographical delations 63 
8. Origin 71 
9. Means of dissemination ....... 72 
(«) Wind , 72 
(5) Water ...... , , t 73 
(c) Animal? ......... 74 
(d) Man ......... 74 
(e) Mechanical Propulsion ...... 76 
10. Gardening and Cultivation ....... 76 
I V, — Systematical Part ......... 81 
1. Synopsis of orders 81 
2. Description of species ........ 89 
V, — Bibliography 
Iadex • • ...... 419 
