which are interesting not only from the standpoint of there is taken as a basis the property that the latter tube, V, permits the phosphorescence to be observed, plant biology, but also from that of the perfumer’s art. possesses of extinguishing the phosphorescence of phos- even in thefulllight.… … phorescence is obtained. The and so difficult of comparison, number of revolutions or frac- that we ask ourselves how it tions thereof is proportional supports the case, D. No, 3. Lever for closing the tube, E, by pressure. is rendered manageable. The to the quantity of air that important point to…
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![An illustration from Essai de physique, par Mr. Pierre van Musschenbroek ... avec une description de nouvelles sortes de machines pneumatiques, et un recueil d'expériences par Mr. J. v[an] M[usschenbroek] Traduit du hollandois par Mr. Pierre Massuet .. (1751)](https://img.insideoutlibrary.com/img/200/ia-essaidephysiquep01muss-431-72.webp)
