436 
POPULAR SCIENCE REVIEW. 
suppose that he considers his hook would have been incomplete did not 
all the paraphernalia of the field-naturalist find a place in his volume. But 
whatever view our readers may take on this point, we can assure them that 
they will find all the information they require in Herr Nave’s Handy-hook, 
and what the text may he deficient in, will he met by the twenty-six ex- 
cellent page-plates which are dispersed through the letterpress. The 
editor’s notes, though they are not numerous, are concise and useful. The 
publisher, it seems to us, would have consulted the convenience of readers 
more, had he distributed the illustrations over the text, instead of grouping 
them in plates. What is gained in beauty by the better working of cuts 
when printed in plates, is lost in time to the student, who is obliged to turn 
over leaves oftener than he requires in order to find the figure to which 
what he is reading refers. This is the only point which, in our opinion, 
needs amendment, and, after all, it is not a very serious one. 
SANTONIN: A VOLCANIC CRATER.* 
T HE islands of the Santorin group have for many years attracted the 
attention of those geologists who sought to discover the origin of 
volcanoes — who tried to solve the problem of the construction of craters. 
Since the recent eruption, so fully detailed in these pages by Professor 
Ansted, Santorin has had many European visitors, especially French and 
German. These have not only carefully investigated the topographical 
features of its islands, but have brought the most subtle instruments of 
science to bear upon the volcanic phenomena, in order to arrive, if pos- 
sible, at the conditions which govern eruptive discharges. Magnetism has 
been especially employed, and has given some startling results. It will be 
understood, therefore, that those islands are objects of the highest interest 
to the philosophic geologist, who hopes by a careful study of them to unfold 
the now mysterious laws controlling the development of volcanoes. The 
work which Messrs. Triibner have issued in an English dress comes in good 
time, and though its text is neither particularly original nor comprehen- 
sively embracing, it is suggestive, and the admirable photographs which 
accompany it are invaluable to those who would study this singular series 
of islands. These photographs are birdseye views of the Kaimeni (or burnt 
islands), and having been taken from carefully-prepared models, they give 
an excellent idea of the outline and general conformation of the rocks. The 
maps, too, show at a glance that the islands Af Santorin, Thera, and Therasia 
are really but portions of a gigantic crater, the remainder of which is now 
submerged. This is the opinion held by the authors, and expressed in 
somewhat stilted and Germanised English in the work before us. u The 
semicircular island of Thera, which, with Therasia and Aspronisi, encloses a 
sea-basin of more than five miles in diameter, containing in its centre three 
islands of historical date, the Kaimenis (or burnt islands), resemble com- 
* 11 Santorin. The Kaimeni Islands, from Observations by K. v. 
Kritsch, W. Reiss, and A. Stiibel.” Translated from the German. London : 
Triibner. 1867. 
