Royal Society. 



195 



Secondary Standards. 

 Thirty secondary standards, of gun-metal protected by amalgam- 

 gilding, were constructed by Mr. Barrow. The densities of these 

 were determined by weighing them in air and in water, and their 

 absolute weights by comparison either with I or with T + D. 



Values of the densities at the freezing-point in terms of the maxi- 

 mum density of water, absolute weights in terms of I, and 

 apparent weights, at Somerset House in air of the temperature 

 65-66 Fahrenheit, under the pressure of 29-75 inches of mercury 

 at the freezing-point of water {t = 18°-7 C, b = 755"'"'-64), or in 

 air for which 10-|-log A = 7-07835, in terms of the commercial 

 pound W of the same density as the lost standard troy pound. 



" On the Determination of Unknown Functions which are involved 

 under Definite Integrals." By J. Gomes de Souza, Professor of Ma- 

 thematics in the Military Academy of Rio Janeiro. 



The author, after referring to a previous memoir on the same sub- 

 jectt presented by him to the French Academy, proposes to himself 



