History & Pathology of Vaccination, Volume 1 Textbook by Edgar Crookshank goes into the archives of Edward Jenner to examine the origins of vaccination. Professor Crookshank was investigating an outbreak of Cow Pox in England nearly 100 years after the disease was said to be eradicated. This is a text only version of this work transcribed by Patrick Jordan, so it contains no editorial commentary. This is an excellent study guide for the scholar or home school curriculum. There are a few original illustrations that depict the genitals of animals, viewer discretion is advised.