92 STRUCTURE AND DEVELOPMENT OF MOSSES AND FERNS. In the concluding chapter Mr. Campbell summarises his views upon the inter-relationships of the Archegoniatce. As to the strength of the arguments upon which these views are based, it must be left to individual readers to judge. By enthusiasts they will be regarded as convincing; by conservatives as fanciful; but by the majority probably as suggestive and eminently helpful. Experts in morpho- logy are certain to offer battle on the subject, and in fighting it out among themselves they cannot fail to place the phylogeny of the ArchegoniatcB on a surer basis than it has yet attained. Mr. Campbell rightly insists upon the important bearing which the gametophyte and the sexual organs have upon the question, but unfortunately these are still but little or not at all known in some of the orders — e. g. Ophioglossacece and Psilotacece. Fig. 240. — Development of the spores of Equisetum maximum Lam. Suc- cessive stages in the division of the nuclei, x 1200; cen. centrospheres ; nw. nucleolus. In places the book shows signs of having been hastily edited — e.g. on p. 189, 1. 7 from end, for "uses" read loses; p. 194, 1. 5, for '•forces" read /aces, and 1. 8, for forms six rows" read six rows are formed; p. 197, 1. 2, for "latter" xeQ,d former ; p. 436, 1. 7, for " tubes" read tubers; p. 158, 11. 2 and 4, for "tufa" read turf. On p. Ill, "incubous" and "succubous" are incorrectly defined.
