Contents 
xv 
CHAPTER XXI 
THE SOURCES OF NECTAR AND POLLEN 
PAGF.B 
Reasons for knowledge of nectar sources — Difficulties of 
identification — Study of neighboring locations—Function 
of nectar—Variations in nectar — Variations in secretion 
—Effects of climatic conditions on secretion—Advantages 
of swamp sources — Cultivation of plants for nectar — Value 
of the minor sources — Gathering of pollen — Value of bees 
in cross-pollination — Damaging effects of incorrect spray¬ 
ing — Bees do not puncture ripe fruit — Supposedly poison¬ 
ous honeys — Plant honey-dews — Insect honey-dew — 
Annotated list of honey-plants . 359-396 
CHAPTER XXII 
BEE DISEASES AND ENEMIES 
Brood diseases — American foul brood — European foul 
brood — Sacbrood or pickled brood — Methods of spread — 
Treatment — Shaking treatment — Fall treatment — Addi¬ 
tional treatment for European foul brood — Diseases of 
adult bees — Dysentery — Nosema disease — Paralysis — 
Spring dwindling — Enemies of bees — The wax-moth ( Gal¬ 
leria mellonella) — The lesser wax-moth (Achroia grissella) 
— Remedies — Other enemies . 397-416 
CHAPTER XXIII 
THE REARING OF QUEENS 
Commercial queen-rearing — Systematic requeening — 
Conditions under which queens are reared — Saving natural 
queen cells — Having natural cells built — Miller method 
— Alley method — Hopkins method — Queen cells on 
artificial bases — Transferring larvae — Swarm box — 
Having cells built out — Nursery cages — Mating hives — 
Classification of queens — Mailing cages — Introducing 
queens — Improvement of stock — Study of breeding needed 
— Selection of drones — Desirability of pure races — 
Danger from inbreeding .417-429 
