51 



tides, transparence, colour, luminosity, mean temperature at different 

 depths, &c., were methodically observed during four years. Algce 

 and animals of every kind were arranged according to their vertical 

 and horizontal distribution, and their natural groups and paragenesis 

 were deduced from the above-mentioned physico-marine observations. 

 A bathygraphical map, and numerous tables and figures, accompany 

 the work, which in a few weeks will be ready for the press . A memoir 

 on new starfishes and polyps collected and described by the author, 

 intended as a precursor to the larger work, appeared in the 39th 

 volume of the ' Sitzungsberichte ' of the Vienna Academy. 



I may add, that Professor Lorenz expresses his readiness to procure 

 for the Royal Society any information that may be desired respecting 

 the natural history of the Adriatic coast, adjacent to Fiume, a service 

 which he appears peculiarly well qualified to render by the nature of his 

 previous researches, as well as by his position as Professor of Natural 

 History at Trieste. 



I am indebted to Dr. Namias, the Secretary of the I. R. Istituto 

 Veneto, for the titles of memoirs that will appear in the 5th volume 

 of the ' Atti ' of that Society. Among these are a memoir on the 

 purple of the Ancients, and the means used in extracting it from the 

 Murex, by Professor Bizio. On some methods of applying electricity 

 in the cure of disease, by Dr. Namias, who is also author of a memoir 

 on electricity, in which he has established some new principles, and 

 for which a prize was awarded by the Istituto Milano. A memoir 

 on the hypothesis of the metamorphosis of power, and on the con- 

 servation of force, by Professor Turazza, is to appear in vol. ix. of the 

 'Raceolta,' in 4to. A general theorem on the teeth of bevel- wheels, by 

 Professor Minich. On instantaneous movement about a point, by Pro- 

 fessor Bellavitis. Comparative examination of some new species of 

 Lichens, and on Chrysothrix noli tanyere y by Professor Massalongo. 



M. Senoner has supplied information respecting works on the 

 Natural Sciences, published by various Societies and individuals. In 

 Vienna, the 'k. k. Zoologische-botanische Gesellschaft' publishes 

 valuable Transactions. The 'Wiener entomologische Zeitschrift,' con- 

 ducted by Lederer and Miller, is a periodical of great merit. The 

 'Oesterr. botanische Zeitschrift,' edited by Dr. Skofitz, contains many 

 excellent papers on the Flora of the Austrian Empire. 



The Geological Surveys by the ' Geogn. montanistischer Verein ' of 



E 2 



