"A Statement of Facts Tending to Establish an Estimate of the True Value and Present State of Vaccination" by Sir Gilbert Blane is a scientific publication written in the early 19th century. This work serves as a comprehensive assessment of vaccination's efficacy, particularly in relation to smallpox, following its introduction by Edward Jenner. The book lays out statistical analyses and personal observations to argue for the significant benefits of vaccination in reducing mortality rates associated with smallpox. In this publication, Sir Gilbert Blane meticulously presents various data sets spanning over several decades to illustrate trends in smallpox mortality before and after the advent of vaccination. He contrasts mortality rates during periods of no vaccination, the practice of inoculation, and the introduction of vaccination. Blane asserts that vaccination has notably reduced smallpox deaths, providing concrete evidence of its success through calculated estimations of lives saved. Additionally, he emphasizes the need for widespread adoption of vaccination to achieve the complete eradication of smallpox, countering prevalent skepticism and criticisms surrounding the practice. The book ultimately advocates for public health initiatives to promote vaccination as essential in combating one of history's most deadly diseases. (This is an automatically generated summary.)