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Bibliography. 449 



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Prof. Sedgwick states in the preface, that the natural groups in the 

 British Pateozoic series which will be recognized and illustrated in the 

 work are as follows :—l. Hypozolc rocks ; 2, Cambrian rocks (1, low- 

 er, below the Bala limestone, 2, upper, above the Bala limestone) ; 3. 

 Caradoc group, which is not represented in Scotland and North Eng. 

 land, but often overlies the Cambrian rocks unconformably in Wales and 

 Shropshire; 4. Upper Silurian, including the beds from the Wenlock 

 shale to the Tilestone ; 5. Old Bed Sandstone or Devonian ; 6. Carbon- 

 iferous ; 7. Permian groups, which end the Palseozoic series, and are 

 immediately followed by the Trias or New Red Sandstone. 



Prof. Sedgwick expresses his thanks to the syndics of the university 

 press, for bearing the expense of the letter press of this part of the 

 work, but adds that it has not been brought before the public without 

 much anxiety, and great personal cost. 



5, Monographic des Polpiers Fossiles des Terrains Palceozoiques 



precede d'^un Tableau General de la Classification des Polypes ; by 



i MM. Milne EmvAUvs and Jules Haime. (Extrait du tome V dei 



i Archives du Museum d'Histoire Naturelle.) 502 pp. 4to, with 20 



plates- Paris, 1851. — This work embraces a general review of the clas- 

 sitication of zoophytes, a synopsis of all known genera, together with 

 f sn elaboration of a large amount of new material, involving the insti- 



tution of many new gi^nera and many changes in the limits of those 

 before established. The results are of the highest value to zoological 

 science, although it may perhaps be questioned whether the farther study 

 of the subject will sustain all the subdivisions. Connected with the ex- 

 tensive work on British fossil corals by the same aulhor, published by 

 the Palseontographical Society, these labors form the most extensive 

 contributions to this department of Palaeontology hitherto made. Be- 

 sides these, other memoirs on zoophytes have been issued by the same 

 authors in recent numbers of the Annales des Sciences Naturelles: 

 and we may say truly that all the publications of Prof Edwards, bear 

 the impress of profound research. The plates are exquisite specimens 

 of art and faithful delineations of the species. 



The work is of great importance to the American geologist, as it in- 

 \ dudes descriptions of many species from the Palaeozoic rocks of this 



country collected by M. de Verneuih It also embraces species from 

 all parts of Europe and from Great Britain, studied from specimens sent 

 to the author for description by prominent geologists or by visiting 

 collections. The whole number of species is about four hundred. 



6. Elements of Analytical Geometry ; by Albert E. Chukch, A.M., 

 Prof. Math., in the U, S. Military Academy, West Point. Author of 

 Elements of the Differential and Integral Calculus. 300 pp. 8vo, New 

 York, 1851. G. P. Putnam.— There are many attractions in the branch 

 of mathematics to which this work is devoted, and a beauty, clearness 

 and brevity hi its reasoning which recommend it for class instruclion- 

 The author states in his preface that while endeavoring to preserve the 

 ^ true spirit of analysis as developed by Biot, in his admirable work on 

 ' the subject, he has made such changes in the arrangement of the mat- 

 ter and the method of demonstration, as he believed would render the 

 whole more attractive and easily acquired by any student possessing a 

 knowledge of the elementary principles of algebra and geometry. 





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