350 NATURAL SCIENCE [May 



assicrned to the Lower instead of to the Middle Devonian ; Silurian 

 limes and fluxes are said to come from the Ludlow beds and only 

 green slates from the Wenlock series. On page 3 we read of the Pax 

 Bntannicac. But slips like these do not materially lessen the value 

 of the work which ought to have a wide circulation among Indian 

 schools. 



An American Astronomy 



A New Astkonomy. 'By David P. Todd, M.A., Ph.D. 8vo, p}i. 480. With 6 

 coloured plates. New York, Cincinnati, Chicago : American Book Company. 

 1898. Price, $1.30. 



We regret that the fascinating science of astronomy does not come 

 within our scope, otherwise it would have given us great pleasure to 

 have reviewed this elegantly illustrated little book, especially as the 

 writing of the review would have given us very little trouble, for the 

 publishers, with a business-like courtesy, have been at the pains to 

 forward us both a short notice and a longer account in pamphlet 

 form, both of which they would kindly permit us to reprint without 

 acknowledgment or extra charge. We must content ourselves with 

 drawing the attention of astronomically-inclined readers to the book. 



Serials 



Knowledge, for April, contains three very interesting articles. 

 Prof. Grenville A. J. Cole writes on the Structure of Ireland, con- 

 sidering it from a broad standpoint as part of Europe. Mr E. Lydekker 

 discusses the Sea-Otter and its extermination, giving a flgure of its 

 upper and lower jaws from a skull collected by Mr Barrett Hamilton. 

 Mr Fred. Enock continues his paper on British Bees. Mr Enock's 

 illustrations should be known to all ; his text is equally clear and 

 interesting. 



In Vol. VI. of the Studies from the Yale Psychologiecd Lcdjoratory 

 (1896), edited by Dr E. W. Scripture, there are researches on reaction- 

 time, on Weber's law in illusions, and on voluntary effort. Perhaps the 

 most generally interesting paper is that by the editor, in which he 

 describes an elementary course in psychological measurements. This 

 gives a good idea of the kind of laboratory work which is carried out 

 at Yale under Dr Scripture's direction. 



A short time ago we announced that Timehri, the Journal of the 

 Eoyal Agricultural and Commercial Society of British Guiana, would 

 cease publication in December last. On receipt of the December 

 number we were pleasurably surprised to find that the magazine 

 would be continued, with a reduced number of pages, at a price of 

 60 cents. (2s. 6d.) a copy. Somewhat appropriately, but we hope not 

 ominously, the present number contains an instructive and amusing 

 article entitled " Abortive Colonial Publications," by the Editor, Mr 

 James Eodway. Mr J. J. Quelch writes on Boa Constrictors 

 (Camoodies as they are called in British Guiana), while Mr C. A. 

 Lloyd contributes notes on some Neotropical Birds. 



In the February Pearsons Magazine the growing appetite of the 

 public for popular natural history is met by an account of the .trout- 

 farm at Guildford. This is interesting reading, and, from our point of 

 view, is more free from scientific eii'ors than is usually the case in 



