16 CORRECTIONS. 
Page 32, last line, after patulis put ,. 
Page 33, line 14, for centralibus, read setaceis. 
Page 34, line 6, after curvato. add (Tab. LI-LII1.) 
Page 35, line 39, for those, read these. 
Page 37, line 7, for to tubercles, read its tubercles. 
Page 37, line 26, for 6 lines; read 6 lines,. 
Page 38, line 18, after cultivation, put in St. Louis, Cincinnati, etc. 
Page 38, line 31, C. pentalophus is erect ‘10-15 inches high’’ only when so trained. It 
grows naturally like C. Berlandieri, C. procumbens and C. Lhrenbergii, Pfeif., all of which 
closely resemble one another in habit. C. Pentalophus has a 5-angled stem of bright green 
color with short spines; C, Hhrenbergii is usually 6-angled, pale green, with numerous long 
and setaceous spines ; flower and fruit of either seem to be unknown. 
Page 38, line 42, DXIX, read LILY. 
Page 39, line 17, LXLYX, read LLY. 
Page 39, line 21. The root of young plants forms a single globose tuber, in older ones it con- 
sists of a cluster of several oval or cylindric tubers, sometimes 6 or 8 in number, 1-14 inch in 
diameter, and 2-3 inches long. 
Page 39, line 29, after family, add : or the specimen observed by Dr. Poselger offered one of 
those rare anomalies (one of which, found by Zuccarini in Cereus serpentinus, was figured by 
him in the Annals of the Munich Academy) where the ovary actually forms the continuation 
and termination of a branch, by which the sagacious observer just mentioned was induced to 
consider the so-called ovary of Cactaceae itself a branch, with the real ovary immersed in it. 
But how would he view it in Mamillaria ? 
Page 40, line 18, after fruit, omit flower. 
Page 40, line 31, before smooth, insert nearly. 
Page 4(), line 31, before linear, put or. 
Page 41, line 13. This is C. Pottsii, Salm, Hort. Dyck, a later name. 
Page 42, line 14, after brevioribus put ,. - 
Page 42, line 16, for albido, read alb:do~. 
Page 46, line 10, for ovari, read ovarii. 
Page 46, line 26. Cultivated specimens of O. grandis are erect, because, tied to the stake, 
they are not permitted to grow otherwise. Their white spines seem to grow dark very soon, 
and the smaller number and greater distance of the spines may be owing to the influence of 
cultivation. There is, therefore, scarcely a permanent character left to distinguish the new 
species from this one. 
Page 47, line 6, after succosa, omit ,. 
Page 47, line 8. This margin is the enlarged and indurated Juniculus itself, which, by a 
lateral expansion, envelopes the seed proper and forms its exterior bony coating. This dilatation 
of the funiculus takes place long before the flowering period ; it covers the ovuluwm so completely 
that only two small lateral openings remain, which lead to the orifice. After Mr, Payen and 
others had already noticed this expansion of the Juniculus, Dr. Caspary, of Bonn, lately has 
more completely investigated its nature. It appears that in many, if not in all other Cactaceae 
the funiculus is bent over the orifice of the ovulum, partly covering it ; (I have seen it in some 
Mamillariae, Echinocacti, and Cerei ;) but that only in Opwntiae it expands into an exterior 
