S72 Koiices respecting New Books. 



ordium, wilh which the author introduces his remarks ^' on 

 the Air,'"' may serve as an example: 



*' After having elucidated the properties of the liquid 

 •which bathes the surface of our globe, or glides along within 

 it, we shall proceed to those of the invisible fluid which sur- 

 rounds it to a great height. Here a very lively self-interest 

 is blended with that which the science inspires of itself, to 

 solicit us towards the study of this fluid ; in the midst of 

 which we arc continually in)niersed, which acts upon us in 

 so many diflerent wavs, and to which we are indebted both 

 for the preservation of life, and for furnishing us with one 

 of its principal delights; since it is to the air that we first 

 commit our thoughts, to be transmitted to others, with the 

 words which are their svmbols." 



A translator of Mr. Gregory's acknowledged reputation 

 inight certainly have taken upon him to retrench such exu- 

 berances, without stepping beyond his province. But, as 

 we have already stated, the work in other respects is valu- 

 able, and, we doubt not, will be found an useful addition 

 to the elementary works on science already in the hands of 

 the public. 



j4?i Essay on tJie Warming of Mills and other Buildings, lif 

 Steam. By Koi'.eutson Buchanan, Civil Engineer. 



This short essay, consisting of only twenty-four pages, 

 contains a variety of curious and useful information, ar- 

 ranged under the following heads : 



I. The proportionate Size of Boilers and Quantity of Fuel. 

 — II. The Proportion of Steam-pipe required to heat a given 

 Space. — III. The Substance and Colour of Steam-pipes. — 



IV. The Direction and Arrangement of the Steam-pipes. — 



V. The Modes of connecting the Steam-pipes ; — and con- 

 cludes with a general abstract of dimensions and proportions 

 of pipes, and important facts relative to a variety of building 

 which have i)cen actually heated by stearn. 



The advantages of cleanliness, convenience, and safety, 

 which this moje of warming buildings possesses, has long 

 made it an object of attention ; but it is only of late that it 

 has been brought into practice, so as \.o be comaiodious and 



certain 



