CONTENTS OF No. XLIII- 
I. The Pole Star and the Pointers. 
II. Peat Bogs. 
III. The Past History of our Moon. 
IV. Modern Researches in Tropical Zoology. 
V. Annual International Exhibitions. 
VI. The Iowa and Illinois Tornado of May 22, 1873. 
NOTICES OF SCIENTIFIC WORKS. 
Perry’s ‘‘An Elementary Treatise on Steam.” 
Fishbourne’s ‘‘ Our Ironclads and Merchant Ships.” 
Pierce’s ‘* Practical Solid or Descriptive Geometry.” 
Kirkaldy’s “ Results of an Experimental Enquiry into the Mechanical 
Properties of Steel of Different Degrees: of Hardness, and 
under Various Conditions.” 
Baird’s “‘ Annual Record of Science and Industry for 1873.” 
Beard’s ‘‘ Legal Responsibility in Old Age.” 
Timbs’s ‘* The Year Book of Faéts in Science and Art.” 
Maunder’s *“‘ The Treasury of Natural History, or a Popular Dictionary 
of Zoology.” 
‘‘ United States Commission on Fish and Fisheries.” 
PROGRESS IN SCIENCE, 
(Including the Proceedings of Learned Societies at Home and Abroad, and 
Notices of Recent Scientific Literature). 
