Notices respecting New Books. 467 



No. of squares. 



2 2 

 3 2 

 4 2 

 5 2 

 6 2 

 7 2 

 8 2 

 September 17, 1874. 



o. of stem- 



Total number 



solutions. 



of solutions. 



















1 



2 



2 



10 



1 



4 



6 



40 



12 



92 



LXII. Notices respecting New Books. 



The Correlation of Physical Forces. Sixth Edition. With other Con- 

 tributions to Science. By the Hon. Sir W. B. Grove, M.A., 

 F.R.S., one of the Judges of the Court of Common Pleas. London : 

 Longmans, Green, and Co. 1874. (8vo, pp. 466.) 



rPHIS Tolume contains the sixth edition of Sir ~W. Grove's well- 

 -*- known essay on the " Correlation of Physical Forces," the third 

 edition of the essay on " Continuity," and a reprint of thirty-eight 

 papers on various scientific subjects which have appeared from time 

 to time in different periodical publications, sixteen of them in our 

 own pages ; the most important, however, appeared originally in 

 the Transactions of the Royal Society, viz. those on " The Gas 

 Voltaic Battery," on " The Yoltaic Action of Phosphorus, Sulphur, 

 and Hydrocarbons," on "The Effect of Surrounding Media on 

 Voltaic Ignition," on "The Electro-chemical polarity of Gases," 

 and the Bakerian Lecture of a.d. 1846, on " Certain Phenomena of 

 Voltaic Ignition, and the Decomposition of Water into its consti- 

 tuent gases by Heat." These papers, says the author, have not 

 been " altered, further than by correcting some mere verbal errors, 

 and in two or three instances incorporating with the text paragraphs 

 printed at the time as foot-notes." The two essays fill just half 

 the volume ; and the five papers whose names we have given above, 

 nearly half the remainder (pp. 112). 



The part of the volume best known to the public is, it need hardly 

 be said, the essay on the " Correlation of Physical Forces," origi- 

 nally published in 1846 as the substance of a course of lectures de- 

 livered at the London Institution in the year 1843. In a lecture 

 delivered in January 1842, and (apparently) printed shortly after, 

 the leading doctrine of the essay had been enunciated in these 

 terms : — " Physical science treats of Matter, and what I shall 

 to-night term its Affections', namely, Attraction, Motion, Heat, 

 Light, Electricity, Magnetism, Chemical Affinity. "When these 

 react upon Matter, they constitute Forces. The present tendency 

 of theory seems to lead to the opinion that all these Affections are 

 resolvable into one, namelv, Motion. However, should the theories 



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