Levels of Knowing and Existence

Levels of Knowing and Existence: Studies in General Semantics (Harper and Row 1959) is a textbook written by Professor Harry L. Weinberg that provides a broad overview of general semantics in language accessible to the layman.
Author.
Harry L. Weinberg was born in Philadelphia, Pennsylvania, in 1913. He received his BS degree from the College of the City of New York in 1933 and his MS in chemistry from the University of Pennsylvania the following year. He worked for a period as a chemist and during the Second World War was engaged with the Merchant Marines. Weinberg's interest in general semantics was stirred by a seminar he attended in 1940 in Chicago presented by Alfred Korzybski and by Korzybski's seminal publication on the subject, "Science and Sanity" (1933), which Weinberg first read in 1940 and reread during his time with the Merchant Marines. His interest in the field prompted him in 1947 to enroll at Northwestern University for graduate work under Irving J. Lee. He received his master's degree from the university in 1948 and his PhD in 1953 in the field of speech.
In 1948 he began teaching at Temple University in Philadelphia as an instructor in Speech and General Semantics and continued to teach there as a professor until his death in 1968. A former student of his relates that "His classes in General Semantics on introductory and advanced levels were popular, and he became well known as an outstanding teacher." Although he wrote many papers on general semantics, his greatest academic contribution, in terms of depth and reach, is widely considered to be his book "Levels of Knowing and Existence".
Subject matter.
"Levels of Knowing and Existence" is concerned with the principle of general semantics and toward that end provides "invariable contextual insights into understanding Alfred Korzybski's "Science and Sanity", discussing epistemological, ethical, aesthetic, etc., problems." Given the subject matter, the book's approach, structure, and language are remarkably straightforward and relatively easy to grasp without prior study in the field. This aspect of the book is even more pronounced when compared to Korzybski's "Science and Sanity", which is invariably considered a very difficult book to understand. Furthermore, unlike "Science and Sanity", Weinberg uses almost no mathematical formulas in his text. Notwithstanding these differences, the two books cover the same basic material and arrive at the same basic conclusions with regard to the central nervous system's abstraction process in general and the uses and limitations of language in particular. Some of those conclusions are summarized as follows:
Chapters.
Chapter headings include: 
Reviews.
The extant reviews of the text are primarily from proponents of general semantics and experts in the field and are invariably favorable. Those who object in general to the theories of general semantics usually focus their criticism on the founder Alfred Korzybski and his publications.
Robert P. Pula, the one-time Director Emeritus of the Institute of General Semantics, stated that he believed "Levels of Knowing and Existence" "may be the best 'middle level' text in general semantics." Pula has also remarked that Weinberg's book is to be commended for adhering to Korzybski's teachings while also "wedded to his [Weinberg's] sometimes startling ability to simply-clarify epistemological complexities that have been torturing over-verbalized Westerners for twenty-five hundred years."