REVIEWS 503 
prepared by Mr. David White accompanies the paper, showing the geo- 
logical horizon as determined by paleo-botany and stratigraphy of the 
insect-bearing localities of the American Carboniferous. 
“‘Die Fossilen Insekten,”’ the second title of this year by Handlirsch, 
is intended to serve as “ Ein Handbuch fiir Paleontologen und Zoologen.” 
The fossil insects are treated chronologically by periods. No insects are 
recognized from deposits older than the Upper Carboniferous. The intro- 
ductory part of the publication contains a synopsis of the orders of recent 
insecta. The Carboniferous insects are described in parts I, II, and II 
to p. 343. Permian insects follow (pp. 344 to 393). Mesozoic insects 
occupy the remainder of part III and IV. The remaining parts to be 
issued will complete the treatment. of Mesozoic and Cenozoic forms in 
order. All known fossil Hexopoda are to be included in this work, and 
the described specimens so far as possible illustrated. 
Sellard’s paper on Odonata is Part I of a paper discussing the leading 
types of Permian insects. A new genus of Odonates, the first of this group 
obtained from the Permian, is described. ‘The conclusions reached from a 
study of the Permian Odonates, and from a comparison of these with the 
Coal Measure forms, are that the wing venation of Paleozoic dragon-flies 
is not fundamentally different from that of modern dragon flies, as believed 
by Scudder, and that the Paleozoic dragon-flies are not to be separated as an 
order from Mezozoic and modern dragon-flies, as is done by Handlirsch, 
Three suborders are recognized for the order Odonata; Protodonata. 
Zygoptera, and Anisoptera. The second paper by Sellards is a résumé of 
the geological history of the cockroaches. Von Schlechtendal regards the 
vein in the hind wing of certain Coal Measure cockroaches, interpreted by 
Sellards as the costa, as being in reality the subcosta. _Woodworth’s paper 
on the wing veins of insects contains critical remarks on the venation of the 
wings of the better-known families of Paleozoic insects. 
E. H. SELLARDS 
The Place of Origin oj the Moon—The Volcanic Problem. By Wit- 
t1AM H. PicKERING. Journal of Geology, Vol. XV, January- 
February, 1007, pp. 22-38. 
To many geologists the arguments of this paper will appear to need no 
refutation and, if published in any other than a leading geological periodi- 
cal, would not call for comment. There is danger, however, that by not 
formally presenting the contrary side of an argument, a greater credit and 
authority may be given to certain views by those in other branches of 
science than is warranted. It is because this article is of a nature which 
