Index 
Aamodt, O. S., 345 
Abstracting service, proposed, 434 
Acanthosicyos horrida, 17 
Achillea fragrantissima, 399 
Achillea santolina, 399 
Adaptation, of animals, 12-155, 
33142 
of plants, 7-12, 332, 338, 343-67 
Admiralty Materials Laboratory, 
research, 260, 274 
Adropogons species, § 
Advisory Committee on Arid Zone 
Research (see UNESCO) 
Africa, 16 
arid area, 121-22 
basic data collection, 137 
climatic maps, 77 
climatic variation, 123-25 
East, use of wells, 126 
location of ground water, 136-37 
locust areas, 384-85 
North, 34, 35, 51 
recharge of aquifers, 132-35 
South, 17, 52 
surface waters, 131-32 
usable ground water, 135 
water budget, Zeerust, 75 
well yields, 126-31 
Agave sisalana, 399 
Agricultural settlement, 
398 
Agropyron species, 186 
Agropyron cristatum, 336 
Agropyron desertorum, 238, 338, 
346, 353 
Agropyron junceum, 398, 401 
Ahlmann, H-W., 167 
Negev, 
Aira caryophyllea, 352 
Alfalfa, 60 
Algeria, 14 
demineralization research, 276 
ecological study, 182 
hydrological studies, 123 
rural improvement, 184 
salinity research, 273 
Aleem We G23 
Anabasis haussknechtit, 399 
Ancient man, 18, 31, 51, 402 
Andean America, 248 
Animals, adjustments, 12-15 
ecology, research needs, 431 
physiology, 370-80 
production improvement, 22-23, 
337-39, 368-79, 377-82 
selection, 61, 333-36 
Antevs, =, 166, 167 
Anthropology, needed 
427 
use, 249 
Aquifer (see Ground water) 
Archaeology, 51-52, 92-93, 98, 
392-935, 4 
needed research, 427-28 
Arid zone, 3~7, 27, 77) 432 
of Africa, 121-22 
of Brazil, 203-8 
extent, 48 
Tunisia, 85 
Aristida ciliata, 186 
Arizona, 5 
control of worthless plants, 238 
introduced grasses, 238 
precipitation, 156, 235, 162-70 
water need and yield, 81, 156 
research, 
445 
