

Recent Advances in the Study of 

 Variation, Heredity and Evolution. 



By ROBERT H. LOCK, M.A„ Sc.D., F.R.H.S., 



Assistant Director of Botanic Gardens, Ceylon. 



New (Third) Edition. With other Illustrations. Crown 8vo. 5s. net. 



" Mr. Lock has brought this new edition thoroughly up to date. The author's 

 scientific work and attainments are such as would lead to the expectation of 

 good material in a book dealing with subjects of such vital and increasing 

 importance to the whole community, and those who read the present work 

 will not be disappointed. It is an admirable summary of the subject, well and 

 lucidly written ... a sound, readable, and reliable work, which will well repay 

 perusal. "—British Medical Journal. 



NEW AND REVISED EDITION. 



The Tides and Kindred Phenomena 

 of the Solar System. 



By Sir GEORGE HOWARD DARWIN, K.C.B., F.R.S. 

 With Illustrations. Crown 8vo. 7*. 6d. net. 



" No scientific library can be efficient without possessing a copy as a text- 

 book or book of reference. The book has now become indispensable to the 

 astronomer and the observatories, to the geodesist and geographer ; in short, 

 to all who wish to know up-to-date facts of the cosmos." — Knowledge. 



JOHN MURRAY, ALBEMARLE STREET, VV. 



Scale of Charges for Advertising in " Science Progress." 



Whole Page 

 Half Page 

 Quarter Page - 

 Eighth Page 



All applications tor space to be made to 



Mr. JOHN MURRAY, 50a, Albemarle Street, W. 



or to 



Mr. H. A. COLLINS, 32, Blrdhurst Road, Croydon. 



(XV) 



