Bibliograpliical Xotices. 159 



of marls and chalk between the Gault or Upper Greensand and the 

 Melbourn Rock, namely, the so-called " Chloritic Marl " (and the 

 " Cambridge Greensand "), the " Chalk Marl " (with the " Tottern- 

 hoe Stone" in some districts), and the "Grey Chalk." These are 

 Bubsequently described as to their characters, range, and fossils, 

 according to the several counties and the northern parts of France. 

 The Middle Chalk (or Turonian Stage) is defined as consisting of 

 zones marked by the occurrence of certain fossils, such as 



3. Zone oi Holaster planus, including the Chalk Rode. 



2. Zone of Tertbratulina gracilis. 



]. Zone of RhipicJionella Cuvieri, or Inocemmus mytUoides, 

 with the MelhoHvn Rode at its base. 

 These successive divisions are described as distributed in the 

 several counties and in the North of France. 



Throughout the long series of Memoirs published by the Geolo- 

 gical Survey of Great Britain and Ireland, descriptive of the districts 

 already surveyed, there are frequent allusions to the economic 

 materials procured from the land, and to the relative conditions of 

 the soil and subsoil. About 1871 the Geological Survey made a 

 point of mapping the " Surface Drifts,'" such as the gravels, brick-earth , 

 and boulder-clay, beginning with those of the Midland Counties, 

 so that the agriculturalists of several wide districts have since then 

 had the opportunity of recognizing and studying the nature and 

 origin of the surface soils in connexion with the notes and explana- 

 tions frequently given in the ' Memoirs.' In fact, the Secretary of 

 the Board of Agriculture, cognizant of the advantages of geology to 

 the farmer, wishes to advauce its publicity and causes copies of the 

 Memoirs to be distributed to scientific centres for recognition and 

 review. 



A Treatise on Zoology. Edited by E. Rat Lankester, M.A., LL.D., 

 F.R.S., &c.— Part I. Introduction and Protozoa. Second Fascicle. 

 1903. London : Adam and Charles Black. 



It has been found necessary to publish Part I. of Prof. Lankester's 

 ' Ti'eatise on Zoology ' in two fascicles, and of these the second 

 forms the subject of the present notice. The decision of the editor 

 not to delay the publication of this volume until the first was ready 

 is undoubtedly, both in the interests of the student and the authors 

 of the several sections, a v?ise one. 



Anything like a complete account of the several contributions to 

 this fascicle would be impossible in the space at our disposal. Four 

 in number, they are the work of Messrs. Farmer, Lister, Minchin, 

 and Hickson, whose names are a sufficient guarantee that the quality 

 of the work is not only sound, but of the best that can be got. 



Prof. Farmer contributes a section on Animal and Vegetable 

 Cells, wherein he traces the history of the cell from the epoch- 

 making discovery by Hooke in 1665 " of the chambered structure of 



