The _Pars Prima_, that was to have been devoted to Trees and Shrubs, was never written. All that exists to represent it, is a stout MS. volume in the Library at the Botanic Garden, Oxford, apparently in Bobart's hand-writing, containing a classification and an enumeration of the species of trees and shrubs, which may possibly have been written with a view to publication. A most interesting feature of Bobart's _Pars Tertia_ is the _Vita Roberti Morisoni M.D._ with which the book opens, written by one of Morison's intimate friends, Dr Archibald Pitcairn. It is the source of all the available information regarding Morison up to the time of his coming to Oxford; after that time much may be gathered concerning him from the records of the University. It is also a loyal defence of Morison and his system of classification against the criticisms to which, even then, he had been subjected. It concludes with a personal account of Morison, in which he is described as being "vigorous in body, having a mind trained to every kind of study, of ingenuous manners, calling a spade a spade, eager for true knowledge, a despiser of filthy lucre, considering the public advantage rather than his private gain." A portrait of him, here reproduced, forms the frontispiece to the volume. Such was the life of the man whose botanical works are now to be considered: works that are not nearly so numerous as they are considerable, as will be seen from the following enumeration and brief description of them. _Praeludia Botanica_, 1669: a small 8vo volume of about 500 pages, which consists of the following parts: (pp. 1-347): _Hortus Regius Blesensis Auctus._ (pp. 351-459): _Hallucinationes Caspari Bauhini in Pinace, item Animadversiones in tres Tomos Universalis Historiae Johannis Bauhini_. (pp. 463-499): _Dialogus inter Socium Collegii Regii Gresham dicti et Botanographum Regium_. _Plantarum Umbelliferarum Distributio Nova, per Tabulas Cognationis et Affinitatis, ex Libro Naturae observata et detecta_, 1672. _Plantarum Historiae Universalis Oxoniensis Pars Secunda, seu Herbarum Distributio Nova per Tabulas Cognationis et Affinitatis ex Libro Naturae observata et detecta_, 1680.