book

I would like to record my sincere thanks to our chairman "Kalvi vallal"Thiru T. Kalasalingam B.Com. and our secretary llayavallal thiru k.sridharan M.B.Awho have me inspiration for my social service. I grate fully acknowledge the encouragement given by our principal Dr.S.Sslvamani M.Sc. ph .D and Dr.S.R.Srikumar M.Sc ph.D.the former principal of arulmigu kalasalingam college of arts and science for the successful completion of this book.

I sincerely thank  to my friends, colleagues and studets for their valuable suggestions and corrections through out this work. I deeply indebted to ny parents, Brothers, my wife B.anitha M.Sc. M.phil  daughter B.aishwarye and son B.Akilan for their patience & encouragement during the prepartion of this book. Healthy criticism  and useful suggestion for the improvement of this  book  is always welcome.
 
                                                                                                                                              K.A.Balasubramaniam.