XX SCIENCE PROGRESS. 



Admirable advice ; but why did the author himself refrain from setting' 

 the first example ? We do not mean to imply that the book is entirely 

 a bad one, far from it ; some good points it undoubtedly possesses, and 

 it may even prove useful. But does Mr. Henslow really think that 

 gymnosperms, as illustrated by Coniferse, are to be regarded as Dicoty- 

 ledons ? And why does he confound Endosperm with the very different 

 body Perisperm ? These examples by no means exhaust the errors 

 which a glance through the pages of his book has sufficed to discover ; 

 but the mention of them is enough to prove that, although the general 

 line adopted may be reasonably commended, anybody who relies ex- 

 clusively on its author's guidance (in spite of his " experience as an 

 examiner for the past forty years ") will subsequently find out that he 

 will have some things to unlearn. 



Essays. By George John Romanes, M.A., LL.D., F.R.S., etc. Edited 

 by C. LI. Morgan. London, New York and Bombay : Longmans,. 

 Green and Co., 1897. 



Many people will welcome this volume of essays by the late Mr. 

 Romanes which Mr. Lloyd Morgan has collected from various reviews 

 and periodicals. 



The essays themselves hardly perhaps demand criticism ; they 

 were written originally as contributions to current literature, and some 

 of them date as far as sixteen years back. But they possess more than 

 the mere ephemeral importance which often attaches to magazine 

 articles ; each one of them is a serious and honest attempt to deal 

 philosophically with questions which not only interested people in the 

 past but which still continue to attract the attention of educated 

 persons. And it is no small tribute to their intrinsic excellence to be 

 able to say that they still retain in a remarkable degree a decided fresh- 

 ness and appropriateness to present conditions of thought. 



In brief the collection is one which not only the friends and ad- 

 mirers of Mr. Romanes (and they are many) will peruse with renewed 

 pleasure, not indeed unmixed with sadness, but one which the general 

 reader will be glad to see rescued from the comparative oblivion of 

 bound volumes of Reviews. 



Diseases of Plants Induced by Cryptoganiic Parasites. By Dr. Karl' 

 Freiherr von Tubeuf. English edition by William G. Smith,. 

 B.Sc, Ph.D. Three hundred and thirty Illustrations. Lon- 

 don, New York and Bombay : Longmans, Green and Co., 1897. 



The study of Plant-pathology is one which has been almost 

 neglected in this country, and yet from a practical point of view it 

 undoubtedly ought to be regarded as of great importance. The compara- 

 tive oblivion under which it is suffered to remain is partly due to the 

 somewhat academic fashion in which Botan}^ is chiefly pursued in 

 England, and this again is brought about by the useless but none the 



