The Popular Cyclopaedia of Natural Science s intended to serve s a guide to those who are inclined to make the wonders of the vegetable kingdom an object of their regard, either as a source of recreation, or with those higher views to which the student of Natural History can scarcely avoid being led. For although no doubt can be entertained by the reflecting mind, that the power, wisdom, and Goodness of the creator are everywhere operating with equal energy, whether in the simple but majestic arrangement of the heavenly bodies, or in those changes by which our own, globe, is rendered fit for the habitation of such innumerable multitudes of living beings, no one cane help feeling that it is in the structure and actions of these beings themselves, that these attributes are more evidently manifested to the intelligent observer. And although the animal kingdom has usually been regarded as affording more remarkable instances of their display than the vegetable world, it may be doubled whether, when the latter is more closely examined, it will not appear equally or yet more wonderful;-the simplicity of the means being most strikingly contrasted with the vastness of the ends attained.

Computational methods are important to all branches of science. The use of computers in chemical research has expanded quickly and research groups specializing in the application of computational methods to chemical problems have been formed in academia and in industry.

The present book, in two volumes, is a pioneering work which discusses many fundamental issues viz. System Theory for computational and inferential chemistry, Density functional theory and computer; collisional relaxation via Eigenfunctional Eigenvalue expansion by computers, Modified QCFF program by computer; Simulation of Infrared spectra by computer, Chemistry instruction through computer; Condensed matter simulation, Prolog, programming in logic; Ground state of the Helium atom; Localized molecular orbitals (MCSCF); Van der Wals surfaces and volumes; Anisotropy and short range atom; Valence bond treatment; The structure of LiNC, NaNC, and KNC; Electrostatic potential and partial charges; Intramolecular hydrogen bonding; Amino Acide pKa; Computer interfacing in instrumental analysis etc. In all there are 40 chapters.

This Encyclopaedia is an outstanding attempt to take full account as much as possible of history of Science and Technology from ancient times to twentieth century. At the same time, an attempt has been made to avoid burdening the text with petty details and maintain a smooth presentation and paint a whole integrated panorama of History of Science and Technology. This set has the obvious advantage of completing large departments of knowledge with the most ancient as well as recent information. It includes History of Physics, Chemistry, Mathematics, Biological Sciences, Computers and Technology. In subject matter, an attempt has been undertaken by a careful division of topics to find a better balance. The major part of the material has been extracted from original sources. The point of view in the present work has been intended always to be objective, impartial and free from conventional platitudes, but this is an ideal and very difficult to attain. The main aim of this Encyclopaedia is to provide a survey of History of Science and Technology with the quest of the young student or the layman. It is hoped that this set will encourage the reader to make his own investigations of the various scientific phenomena.

Throughout the process of compilation and editing of this set, sincere efforts have been made to make this Encyclopaedia as a ready reference for undergraduate 'and postgraduate students of Science, Biology, Engineering, Computer, Agriculture, Environment, Medicine, Marine and Biochemistry and also for those appearing for competitive examinations, research scholars, teachers and alike.

This set is an outstanding attempt to take full account as much as possible of History of Science from ancient times to twentieth century. At the same time, an attempt has been made to avoid burdening the text with petty details and maintain a smooth presentation and paint a whole integrated panorama of History of Science. This set has the obvious advantage of covering large departments of knowledge with the most ancient as well as recent informations. In subject matter, an attempt has been undertaken by a careful division of topics to find a better balance. The major part of the material has been extracted from original sources. The point of view in the present works has been intended always to be objective, impartial and free from conventional platitudes, but this is an ideal and very difficult to attain. The main aim of this set is to provide a survey of History of Science with the quest of the young student or the layman. It is hoped, that this set will encourage the reader to make his own investigations of the various scientific phenomena. Throughout the process of compilation and editing of this set, sincere efforts have been made to make it as a ready reference for undergraduate and postgraduate students of Science and Science and also for those appearing for competitive examinations, research scholars, teachers and alike.