298 THE AMERICAN NATURALIST. 
the wood is found. In most cases the wood may be cut with a saw; 
it softens readily in water, and sections may be cut in the usual 
manner with as much faciljty as if taken from an existing tree. In 
many cases, also, the grain and bark are recognizable, while the 
interior structure is preserved with great perfection. P. 
Polish Palæozoics, by Gürich.' 
memoir is in Southern Poland, mainly in the country between and 
around Kielce and Opatów. This region has been subjected to con- 
siderable oscillation, and the rocks are folded and faulted to a 
marked degree. The geological section extends from the Cambrian 
to the top of the Devonian, and the strata reach their greatest devel- 
opment in the Devonian. The Cambrian is represented by a single 
member, the Silurian by four members, and the Devonian by twenty. 
The Devonian fauna is especially rich, and represents, together with 
others, the typical zones of RAynchonella caboides, Stringocephalus bur- 
` tini, and Goniatites intumescens, so characteristic of certain faunas 
and horizons in other parts of the world. 
The new genera described comprise Plagiopora, a tabulate coral; 
Ceratophyllum and Hexagonum, cyathophylloid corals ; Spirillopora, 
a bryozoan; and four genera of ostracoda, Antitomis, Trigonocaris, 
Polyzygia, and Poliniella. 
Interesting studies are made on the amount of crustal oscillation, 
and the nature of the sediments, whether shore, near shore, off shore, 
or deep sea. These observations are plotted in curves, on tables of 
the geological succession for various localities. CEB 
1 Das Palzozoicum Polnischen Mittelgebirge, von Dr. Georg Giirich. 7vans- 
actions of the Imperial Mineralogical Society of Russia, vol. xxx, 1896. 
