there are certain massage techniques that cannot be replaced accurately by machines without losing something in the process. After introducing the unique machines used to give people massages, the improvements to the devices over time are examined. Kellogg takes care to mention Metzger and Isidor Zabludowski, two prominent masseurs that were well-established at the time this work was written. However, he dotes on the practices of Zabludowski, and tends to dismiss Metzger as someone who has not contributed in a way that Kellogg deemed substantial or helpful to the growth of the practice. Through this neglect of Metzger, Kellogg makes it clear that he values the physiological effects of the massage greatly when he claims that Metzger has done nothing to assist in this field. The next section attempts to make a distinction between men and women in terms of the number of muscles they each have. A chart was made describing each type of muscle being observed. In every category, men were believed to have more muscles than women. There was not one category where the number of muscles present in men was equal to the number in women. After this, Kellogg talks about the importance of rest. He mentions the fact that for many years, people and doctors had believed rest was a crucial part of recovering from illnesses. However, he said that the concept of rest had become so powerful that at the time he wrote this piece, people actually started to think of the process as a "rest-cure". Kellogg has detailed notes about rules that masseurs should follow, such as not massaging anyone while sick, making sure that they look professional and clean, and giving the massage in a room of a certain temperature range (75–85˚ F). Besides these guidelines, he also takes the time to describe to others all of the various terminology involved with the field. Definitions are provided for words such as massage, masseuse, and for direction of movements like "centripetal". Then, there is an extensive chart provided that goes into detailed information about the names of the muscles, nerves associated with it, and the actions that the particular muscle has in relation to the rest of the body. Alongside the chart, there is some information about muscle contraction and the chemicals that may be involved in movements. Appendices After the main sections, there is a group of appendices. Appendix one focuses on