L ANIMALCULA OF INFUSIONS, 59 



and properties, which induced me to refolve not 

 tpnegled trying the efFed of odours upon them. 

 I began with that of camphor : the refult was 

 precifely the fame as has been obferved in infeds. 

 The vapours of this refm occafioned fudden agi- 

 tation and difcompofure in the animaicula : they 

 endeavoured to retreat from the malignant fumes, 

 by retiring deep into the infufions. If the va- 

 pour was rare, they were long of dying ; b.ut 

 when denfe, it immediately became fatal. The 

 odour of the oil of turpentine killed them, but 

 not fo foon as camphor. The fumes of tobacco 

 were not fatal for fome hours : but thofe of ful- 

 phur, inftantaneoully (i). 



The liquids ufed in my experiments were chiefly 

 oleaginous, becaufe thefe are mortal to infeds : 

 they were no lefs fo to animaicula. I omit 

 the fpirituous or corrofive, which killed them in 

 a moment ; as alfo fait water, vinegar, ink, 

 brandy, and fpirit of wine. 



We could hardly believe that human urine 

 produces animaicula, after Handing a few days, 

 as Hartfoeker has obferved, if the fame phenome- 

 non was not daily obferved in vinegar, which h 

 full of microfcopic eels, though a fluid equally 

 deftrudive to animaicula as urine. Repeating- 

 G 2 the 



( 1 ) Odours penetrate deep into water, but to a very 

 different degree : Some will traverfe feveral inches, others 

 not one. I'here are a few curious experiments on the lub- 

 l-'-d. Senehier Phyjiologic Vegttale. Tom. 5. chap. 6 T, 



