SCIENTIFIC NEWS. 



SCIETS^TIFIC NEWS. 



317 



"The Elements of Experimental Chemistry, by William Henry's 

 Henry, M. D. F, R. S. Sfc. The Qlh Edition, greatly Jl^'^S'v!^ 

 enlarged; and illustrated with jyine Plates engraved by 



LowRY. 2 vols. 8vo. 1138 p. 



F= 



EW of our chemical readers can be unacquainted with 

 the useful work of Dr. H., that first appeared in 1800, 

 wnder the title of an Epitome of Chemistry, forming a 

 volume of about 200 p. in 12mo; and subseqvientiy in- 

 creased, through successive editions, to a thick 8vo, The 

 unexampled progress made in the science of chemistry 

 within the last two years has rendered such an additiot> of 

 new matter necessary, that the bulk of the present edition 

 is more than double that of the last ; and as much alteratioa 

 ■was requisite on the same account in what h&d before been 

 written, it may now be considered almost as a new work. 

 -Accordingly the author has altered its title, to render it 

 more appropriate to its present state. It would be super- 

 fluous to say more of its merits, than that it is worthy of its 

 author; and of a work so long before the public noti)ing 

 more can be necessary, than to point out wl)at has been 

 done in the present edition. The chapters on Chemi- 

 cal Affinity, and Heat or Caloric, have received copious 

 irjtit)ductions, explaining their theory and laws. After 

 the chapter on Water follows one entirely new on the 

 Chemical Agencies of Common and Galvanic Electricity. 

 The analysis of the fixed alkalis and ammonia, and an 

 account of their bases, render the chapter on Alkalis almost 

 wholly new ; and nearly the same may be said of the fol- 

 lowing chapter on Earths. The chapter on Acids, which 

 was a mere enumeration of their characteristic qualities in 

 less than a page, now very advantageously occuf)ies seven 

 with a disquisition on their nature and properties. The 

 introductiou to chap, viii, on the General Properties of 

 Metals, is completely rewritten, and much enlarged. Bitn- 

 noens, and the Vegfetuble Principles of Asparagus, Elm 



tree 



