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The study of plant development in recent years has often been concerned with the effects of the environment and the possible involvement of growth substances. The prevalent belief that plant growth substances are crucial to plant development has tended to obscure rather than to clarify the underlying cellular mechanisms of development. The aim in this book is to try to focus on what is currently known, and what needs to be known, in order to explain plant development in terms that allow further experimentation at the cellular and molecular levels. We need to know where and at what level in...

The year is 1072.
The Normans have captured England. The Turks have captured a Norman knight. And in order to free him, a soldier named Vallon must capture four rare hawks.
On a heart-stopping journey to the far ends of the earth, braving Arctic seas, Viking warlords, and the blood-drenched battlefields, Vallon and his comrades must track down their quarry one by one in a relentless race against time.
The scale is huge. The journey is incredible. The history is real. This is Hawk Quest.

AN EPIC HISTORICAL QUEST SET AT THE DAWN OF THE AGE OF GUNPOWDER.
In the world after 1066, vast empires clamor for dominance.
From the Normans in the north to the Byzantines in the south, battles rage across Europe and around its fringes. But in the east, an empire still mightier stirs, wielding a weapon to rule the world: gunpowder.
Seeking the destructive might of this 'fire drug, ' the mercenary Vallon -- a man made of grit and earth as much as of flesh and blood -- is sent by the defeated Byzantine emperor on a secret and near-impossible quest to the far off land of Song...