BOTANY. 83 
1882, were cancelled in 1888, the ‘“‘ Contents” being added to the title and the Index 
replaced (as in Vol. I.) by one for the complete series of four volumes, this being 
inserted at the end of Vol. IV. 
55. Vol. III.: by W. B. Hemsley ; the Cycadacee by W. T. Thistelton-Dyer. 
The Incomplete, Monocotyledones, and Cryptogamic Vasculares, Nyctagina— 
Rhizocarpe, are enumerated in Vol. III. The Cycadacee, pp. 190-195, were studied 
by Mr., now Sir W. T. Thistelton-Dyer, and his portion of the subject was issued 
in 1883. 
56. Vol. 1V.: by W. B. Hemsley. 
This Volume, the last of the series, exclusive of that occupied by the Plates. 
includes: (1) The Supplement to Vols. I.-III.; (2) The enumeration of a small 
collection of plants made in Cozumel Island in 1885; (3) A list of plants from 
Holbox, Mugeres, Cozumel, and Ruatan Islands made in 1886; (4) Additions to the 
list of Costa Rican ferns, bringing the number up to 134; (5) Appendix. The 
Appendix deals with a variety of subjects: (i.) Preliminary remarks; (ii.) A sketch of 
the history of the botanical exploration of Mexico and Central America ; (iii.) Outlines 
of the geography and the prominent features of the Flora of Mexico and Central 
America ; (iv.) Summary and analysis of the Flora; (v.) Relationships with the Floras 
of other regions; (vi.) Further details of the distribution of some of the more 
prominent natural Orders ; (vii.) A specimen of the mountain Flora of South Mexico 
and Central America; (viii.) Altitudinal distribution of Orchids in South Mexico 
and the dominating features of the general vegetation; (ix.) Recapitulation of the 
dominant features of the Flora of Mexico and Central America, and remarks on its 
probable derivation ; (x.) Bibliography. ‘The general index, as stated above, occupies 
pp. 333-498. The total number of species enumerated in the four volumes is 
11,626, of which 196 are indicated as new by the authors. 
57. Vol. Vv. : by W. B. Hemsley. 
The 111 Plates (including XLI.*), eighteen of which are coloured, together form 
Vol, V. of this subject. A complete list of the 144 species figured is given on 
pp. v-viii. Plate CX. consists of a Map of Mexico and Central America, showing the 
then known northern limits (in 1887) of the Phanerogamic epiphytes, the Coco-palm, 
the Marcgraviacee, the Vochysiacez, and the scuthern limit of Pines. 
