Summary: The book "Control of Transcription" contains proceedings of the Calcutta Symposium on the topic held in 1973, covering genetic transcription in prokaryotes and eukaryotes. It includes discussions on RNA polymerase structures, transcription control in various systems like Bacillus subtilis, bacteriophages infected hosts, and E. coli post-infection with T4 phage, elucidation of RNA initiation sequences in T4 DNA transcription, and DNA:RNA hybridization in Neurospora crassa. The symposium participants, including Sankar Adhya and P. Chambon, contributed to the understanding of transcriptional controls, termination mechanisms, and replication of DNA. The book showcases the importance of factors like proteins and specific elements in regulating gene expression. Experimental findings from various growth stages of Neurospora and avian erythrocyte nuclei are presented, shedding light on the repression of transcriptional activity by specific factors. The significance of phage infection in modulating gene expression and the coupling of transcription with replication processes are also highlighted.