Notices respecting New Books. 



535 



tain a sufficient quantity of 

 water to be raised by artificial 

 pressure into the upper one for 

 exposure to the atmosphere. 



To use the apparatus, pour 

 water into it until it rises to the 

 zero in the glass tube, then by 

 means of a syringe force air 

 through the tube x into the 

 lower vessel, so as to raise the 

 water into the upper one to any 

 height you please. Now shut 

 off the stopcock beneath to 

 retain the water in the upper 

 vessel ; then, having exposed 

 the apparatus for any length of 

 time that is required, open the 

 cock, when the water will iim 

 into the lower vessel, filling it 

 and part of the glass tube, the 

 divisions of which will now indi- 

 cate in hundredths the quantity 

 of water evaporated. 



I am. Gentlemen, 



Your obedient Servant, 

 122 Regent Street, JoiiN Newman. 



London, Nov. 10, 1852. 



LXXXIII. Notices respecting New Books. 



Life Contingency Tables. — Part I. The Chances of Premature Death 

 and the Vatue of Selection among Assured Lives. By Edwin 

 JAMf;s Faruen, Fellow of the histitute of Actuaries, and one of the 

 Actuaries authorized to certify Tables for Friendly Societies. 



^r'HE continual increas-c which has been, for many years jiast, 

 -*- taking place, more j/articuhuly in this country, in the amount 

 of proj)crty either assured upon human life, or in some way or other 

 depending upon it, has rendered the accurate determination of its 

 average duration a matter of the utmost imj)ortance ; and accordingly 

 many most laborious researches have from time to time been entered 

 upon, with a view to ascertain not only the true rate of mortality 

 prevailing amongst the general population, but also that found to 

 obtain in particular localities, or under circumstances not of an ordi- 

 nary character. 



In the very al}le work before us, Mr. Farren has proposed to him- 

 self the resolution of a problem looked at with much interest by 



