1823.] the principal Mountain Chains of Europe, 219 



Beraun, and Duckau ; and the other from Eypel to Laun and 

 Saatz, small patches being scattered over this district. On the 

 confines of Bohemia and Moravia, especially between Hohen- 

 mouth and Tribau, it is still more abundant ; it forms hills many 

 hundred feet high on the north of Tribau. 

 It also occurs near Brisau and Lissitz. 



(F.) Basin of Swahia and Bavaria, 



This basin appears to exhibit cretaceous marls and chloritose 

 chalk, hke that of Bohemia on its southern border at the foot of 

 the Alps, e. g. south of Munich, at Berg, and near Gastein. 



(To le continued.') 



Article XIII. 



Analyses of Books. 



Philosophical Transactions of the Royal Society of London, for 

 1823. Part L 



Upon perusing this part of the Philosophical Transactions, 

 we find, with respect to several of the papers it contains, having 

 already given such full reports of them as they were read before 

 the Society, that we have little more to do in the present analy- 

 sis than to refer the reader to those reports ; correcting, how- 

 ever, as we proceed, a few shght inaccuracies in them, and 

 supplying a few unavoidable omissions. 



1. The Croonian Lecture. — Microscopical Observations on the 

 Suspension of the Muscular Motions of the Vibrio Tritici. By 

 Francis Bauer, Esq. FRS. FLS. and HS. — -(See Annals, N. S. 

 v. 66,) 



" This minute animal, the vibrio tritici," Mr. Bauer informs 

 us, " is the immediate cause of that destructive disease in wheat, 

 known under the name of ear cockle, or purples, by farmers. 



*' On opening some of the diseased grains, I found their cavi- 

 ties filled with a mass of a white fibrous substance, apparently 

 cemented together by a glutinous substance, and formed into 

 balls, which could easily be extracted entire from the cavities of 

 the grains, and which, when immersed in water, instantly dis- 

 solved, and displayed in the field of the microscope, hundreds 

 of perfectly organized extremely minute worms, all which, in less 

 than a quarter of an hour, were in hvely motion." 



In order to ascertain how these animals are propagated, and 

 how they are introduced into the cavities of the young germens, 

 the author " selected some sound grains of wheat, and placed 

 some portions of the mass of worm^ in the grooves on the poste- 

 rior sides of the grains, and planted them in the ground m the 



