434 Scientific Intelligence. 



5, Microgeology of Ehrenherg, — A contmiiation of Ehrenberg's great 

 Tiv^ork has been recently issued, consisting of 88 pages large folio; and it 

 relates exclusively to North America. It consists of descriptions of earths 

 and river sediments, from the different states of the country, as regards 

 their infusorial contents, and tables of the results for each. The parcels 

 examined and here described amount to 247, 85 of which are from 

 Texas, 4 from Arkansas, 36 from the Washita and Neosho, etc. The 

 number of microscopic species observed by Ehrenberg and Bailey in the 

 Southern United States is 855; of these 148 are brackish water and 

 marine species, about half of them being fossil and half living, 



6. Note on New Fossih in the Potsdam Sandstone at Keeseville^ New 

 York ; by J. D. Dana. — Hitherto the Potsdam Sandstone of New York, 

 the lowest rock of the Silurian, has been known to afford no fossils but 

 one or two species of the genus Lingula. Through the researches of a 

 young and energetic student in geology, of New Haven, Mr. Frank H. 

 Bradley, who visited Keeseville last summer and has recently been again 

 at the locality, a species of Trilobite (genus Calymene) has been discov- 

 ered, and also one o^ Pleurotomaria^ besides an impression of a crinoidal 

 disk. The Pleurotoraaria is only a cast. The Trilobite, although a small 

 one, its breadth but one-eighth of an inch, is well preserved. The buck- 

 ler and caudal extremity have not been frnmd together, but the markings 

 of each are yqtj distinct. — Proceedings Montreal Meeting Amer, Assoc. 



III. BOTA^ST AND ZOOLOGY. 



?/ Course of Botany ; Structural 

 brief Outline of 



and 



ncal 



/ Plants. "By Arthlk IIenfukv, F.RS., L.S., &c., Pro- 

 fessor of Botany in King's College, London, etc 1857, pp. 702, small 

 12mo. London, Van Voorst. — This is a well-planned, compact, and com- 

 prehensive work, in which we may say, that the author has fairly accom- 

 plished his purpose, namely : — "to produce a good working text-book for 

 the student, from which may be obtained a groundwork of knowledge m 

 all branches of the science, without the attention being diverted from the 

 more striking features of the subject by details comparatively unim- 

 portant," 



The work is divided into four parts: L Morphology or Comparatue 

 Anatomy, treating, in successive chapters, 1st. of General Morphology; 

 2nd, of the Morphology of the Phanerogamia, or the parts of Flowering 

 plants and their modifications, and the Jaws which regidate them ; 3d, 

 Morphology of the Cryptogamia. Part TL Systematic Botany; tr-atmg 

 Lst, of the principles of Classification; 2nd, of systems of Classificatjon- 



and 3d, systematic descriptions of the Natural Orders, followed by an arti- 

 ficial analysis. Part III. Physiology ; oomprising, 1st, the physiological 

 anatomy of plants; 2d, general considerations on the physiology ot 

 plants; 3d, physiology of vegetation ; 4th, the reproduction of plants; 

 6th, Miscellaneous phenomena, under which are ranked the evolution oi 

 teat in plants, luminosity, and movements of plants. Part IV. Gcograpn- 

 ■ ical and Geological Botany, very summarily disposed of in about loitj 



i 



