This page needs to be proofread.
x
FOREWORD
rewriting and revising of this treatise. When the first edition appeared, it was the first of its kind to appear in the English language. In bringing the book up to date and adding considerable new material, Dr. Hou has not only enhanced its usefulness but he has shown the public how an interesting and comprehensive treatise can be written on such a special subject as the Ammonia Soda industry.
K. C. Li
Woolworth Building
New York, N. Y.
