differentiate between Bergey\'so Manual of systematic bacteriology and Bergey\'s Manual of Determinative Bacteriology. Solution ANS: David Berger published a book (1923) on bacterial classification based on bacterial species. The book is named as “THE BERGEY’S MANUAL OF DETERMINATIVE BACTERIOLOGY”. This book is the \"BIBLE\" of bacterial taxonomy. In his first edition he classified bacteria on basis of phenetics, but the second is based on phylogenetic studies. Bergey\'s Manual of systematic bacteriology: In this bacteria’s are classified on the basis of genetic relationship and its evolution. It explains eu- and archaebacteria phylogenetic information based on r RNA sequencing. Bergey\'s Manual of Determinative Bacteriology: In this bacteria’s are classified on the based on cell wall composition, morphology, biochemical tests and differential staining etc... According to this eubacteria and archaebacteria is identified by different identification schemes..