The Miceoscope. 319 



in which a crescent-shaped, shrivelled, homogeneous substance rep- 

 resents the nucleus. Fifthly, simple holes were found which appear 

 to correspond to the position of the nuclei. The author gives a 

 short account of the division of the nucleus, of the pigment, and of 

 the pigment in relation to the segment. Pigment has no causal 

 relation in the nuclear changes. — Jour. R. M. Society. 



Vascular Bundles of Zea Mays. — Herr H. Potoni6 describes 

 the development of the small anastomoses, which, in the 

 leaves of the maize, connect the principal longitudinal vascular 

 bundles transversely with one another, and points out the singular 

 fact that the conducting tissue represented by the parenchyma- 

 sheath of these anastomoses is of the same origin as the elements of 

 the anastomosing bundles themselves, and differs in origin from the 

 parenchyma-sheaths of the principal bundles, which are of a similar 

 value from a physiological point of view. — Journal Royal Micro- 

 scopical Society. 



NEWS AND NOTES. 



Prof. D. S. Kellicott, of Buffalo, has been appointed to the 

 Chair of Biology, Ohio State University. 



Dr. Alfred C. Stokes contributes to the June and July Swiss 

 Cross, a very readable article on "An Old Dutch Microscopist " 

 (Leeuwenhoeck), and what he did. 



M. Grand 'Eury has propounded a theory that coal was origin- 

 ally a liquid generated by the decomposition of inferior vegetation in 

 an atmosphere highly charged with carbonic acid. The carbon of 

 the jelly-like mass thus formed, after passing through various trans - 

 foi'mations, into asphalt, petroleum, bitumen, etc., finally assumed 

 the form of coal. The author cites various facts connected with the 

 occurrence of coal, which, he thinks, are better explained on his 

 theory than by the usual one. — Popular Science Monthly. 



BOOK REVIEWS, 



The Modern Treatment op Diseases op the Liver, by Prof. Dujardin- 

 Beauuietz; trauylated by E. P. ilurd, M. D. 



Another attractive volume of the " Physicians' Leisure Library" 



has just appeared from the publishing house of Geo. S. Davis, under 



the above title. The book is divided into seven chapters, each of 



which is complete iu itself. To those who are interested in diseases 



of the liver, this little book will be welcome. 



