A short and plain account of inoculation : With some remarks on the main arguments made use of to recommend that practice, by Mr. Maitland and others. By Isaac Massey, apothecary to Christ's Hospital. The third edition. To which is added, a letter to the learned James Jurin, M.D.R.S. Secr. Col. Reg. Med. Lond. Soc. In answer to his letter to the learned Dr. Cotesworth, and his comparison between the mortality of natural and inoculated small pox.