Research in science education has recognized the importance of history
and philosophy of science (HPS). Nature of science (NOS) is considered
to be an essential part of HPS with important implications for teaching
science. The role played by textbooks in developing students' informed
conceptions of NOS has been a source of considerable interest for
science educators. In some parts of the world, textbooks become the
curriculum and determine to a great extent what is taught and learned in
the classroom. Given this background and interest, this monograph has
evaluated NOS in university level general chemistry textbooks published
in U.S.A. Most textbooks in this study provided little insight with
respect to the nine criteria used for evaluating NOS. Some of the
textbooks, however, inevitably refer to HPS and thus provide guidelines
for future textbooks. A few of the textbooks go into considerable detail
to present the atomic models of Dalton, Thomson, Rutherford, Bohr and
wave mechanical to illustrate the tentative nature of scientific
theories --- an important NOS aspect. These results lead to the
question: Are we teaching science as practiced by scientists? An answer
to this question can help us to understand the importance of NOS, by
providing students an HPS-based environment, so that they too (just like
the scientists) feel the thrill and excitement of discovering new
things. This monograph provides students and teachers guidelines for
introducing various aspects of NOS, based on historical episodes.