BY R. GRKIG-SMITH. 



319 



the disinfecting time varied from 5 to 30 minutes. An 80% 

 emulsion, that is, four parts by weight of eineol to one of water,* 

 had a lethal period of 3 minutes, a 66% emulsion had 2 minutes, 

 and a 50% had 1A minutes. Then the period began to lengthen 

 as the eineol percentage became smaller. The expressions 1 : 2, 

 1 : 5, and so on, which occur in the tabulated results, mean 1 in 2 

 and 1 in 5 bv weight of oil and water. 



Minutes 



Text-fig. ii. — Cineol with Short Exposures. 



The curve of cineol rises slowly from the turning point at one 



and a half minutes to the three minute interval before rising 



very rapidly. This lag or period of quiescence is met with in 



many disinfectants. The rapidity of the rise from the three 



* Tabulated as 1 : 1£. 



