353 Dr. ingenhousz on the Salubrity 
p. 1 55 <b, \ the refult of which trial was, that after the 
firft meafure of nitrous air was let up, the column of 
both airs occupied 1.86, or one meafure and of a mea- 
fure ; after the fecond meafure of nitrous air was let 
up, the bulk of both airs occupied 202, or two meafures 
and ~ of a meafure : and after the third meafure of ni- 
trous air was let up, the remaining bulk of both airs oc- 
cupied 2,96, or To^of a meafure : fo that the remain- 
/ r 
ing bulk of both airs employed in the experiment ( viz. 
two meafures of common and three of nitrous air, each 
making 1 00 fub^divifions of the glafs tube) amounted 
to two meafures and T 9 ^ of a third meafure, or to 296 
fub-drvifions, which being fubtracted from the five mea- 
fures, or from the 500 fub-divifions employed, the re- 
mainder was 2.04, which was exactly the quantity of 
both airs deftroyed. 
Give me leave, before I proceed farther, to recall to 
your memory fome of the experiments relative to this 
fubjeft, made in my country retreat in the courfe of laft 
fummer, and related in my book, principally in p. 1 55. 
and 282. together with fome further ones I made juft 
(b) It confrfts in letting up into the divided glafs tube two meafures of com- 
mon air, and afterwards three meafures of nitrous air, one after another, 
fhaking the tube in the water trough after each meafure of nitrous air, and be- 
ginning conftantly this motion exa&ly at the moment the two airs come into 
contaft with each other, or even before they meet, which is fbill better. 
4 before 
