PHYSICAL SCIENCE. 

 Airy (G. B.) POPULAR ASTRONOMY, with illustrations. 



By G. B. AIRY, Astronomer Royal. Seventh and cheaper Edition. 

 i8mo. cloth. 45-. 6d. 



This ^vork consists of Six Lectures, which are intended ' ' to explain 

 to intelligent persons the principles on which the instruments of an 

 Observatory are constructed (omitting all details, so far as they are 

 merely subsidiary), and the principles on which the observations 

 made with these instruments are treated for deduction of the distances 

 and weights of the bodies of the Solar System, and of a few stars, 

 omitting all minutice of fornmlte, and all troublesome details of 

 calculation." The speciality of this volume is the direct reference of 

 every step to the Observatory, and the full description of the methods 

 and instruments of observation. 



Bastian (H. C. M.D., F.R.S.) THE MODES OF 



ORIGIN OF LOWEST ORGANISMS : Including a Discussion 

 of the Experiments of M. Pasteur, and a reply to some Statements 

 by Professors Huxley and Tyndall. By H. CHARLTON BASTIAN, 

 M.D., F.R. S., Professor of Pathological Anatomy in University 

 College, London, etc. Crown Svo. ^s. 6d. 



The present volume contains a fragment of the evidence which will be 

 embodied in a much larger work noiv almost completed relating to 

 the nature and origin of living matter, and in favour of what is 

 termed the Physical Doctrine of Life. ' ' It is a work worthy of the 

 highest respect, and places its author in the very first class of scientific 

 physicians. . . . It would be difficult to name an instance in which 

 skill, knotvledge, perseverance, and great reasoning power have been 

 more happily applied to the investigation of a complex biological 

 problem.' 1 ' 1 British Medical Journal. 



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