The present translation is based upon the text of the second Ger-
man edition, published in 1924. Certain passages of no great interest
to English readers have been omitted and a chapter dealing with
more or less purely German controversies has been placed in an
appendix. The comments on policy, however, in Part III, chapter vi,
have been left as they appeared in 1924.1 But the author, who has
most generously lent assistance at every stage of the translation,
has written a special introduction in which he outlines his views
on the problems which have emerged since that date.
Concerns about the potential environmental, social and economic
impacts of climate change have led to a major international debate over
what could and should be done to reduce emissions of greenhouse gases,
which are claimed to be the main cause. There is still a scientific debate
over the likely scale of climate change, and the complex interactions
between human activities and climate systems, but, in the words of no
less than Governor Arnold Schwarzenegger, ‘I say the debate is over. We
know the science, we see the threat, and the time for action is now.’...
These heavier birds have more muscle. They grow fast and can quic-
kly reach a high slaughter weight. This requires plenty of high quality
feed. It requires special skills to keep this in good supply and balance.
Hybrids or cross-breeds result from combining special lines or strains
of chickens developed for this purpose with e.g. a local breed. The
hybrids are more productive. In countries in the South, cross-breeding
between pure breeds is also common, e.g. White Leghorn crossed with
Rhode Island Red. Nowadays hybrid breeds have become very com-
This book discusses an emerging approach to
architecture in which building performance is a
guiding design principle. This architecture places
broadly defined performance above, or on a par
with, form-making; it utilizes digital technologies of
quantitative and qualitative performance-based
simulation to offer a comprehensive new approach
to the design of the built environment.