EXPERIMENTS. 209 



cuples the whole field of the microfcope. The 

 iirft time I obferved thefe globules, I imagined 

 them to be foreign bodies which had fallen into 

 the liquor. But, after examining different drops, 

 I found that the whole liquor was compofed of 

 thefe lar":e jrlobules. I obferved one of the 

 largefl: and roundell of them for a long time. 

 At firft it was perfedly opaque : A little after, 

 I perceived on its furface, about half way be- 

 tween the centre and circumference, a beautiful 

 coloured luminous ring, which continued more 

 than half an hour, then graduaUy approached 

 the centre, which became clear and coloured, 

 while the reft of the globule remained opaque^ 

 This light, which illuminated the centre, refem- 

 bled that which appears in large air- bubbles. 

 The globule now began to grow flat, and to 

 have a fmall degree of tranfparency : And, after 

 obferving it for three hours, I could perceive no 

 other change, no appearance of motion, either 

 internal or external. I imagined that fome change 

 might happen by mixing the liquor with water. 

 The globules were indeed changed into a tranf- 

 paient homogeneous fluid, which prefented no- 

 thing worthy of remark. I left the femen to 

 liquify of its own accord, and examined it at the 

 diltance of 6, 12, and 24 hours; but found no- 

 thing like life or motion. 1 relate this experi- 

 ment to fhow, that the ordinary phaenomena 

 arc not always to be expedted in feminal fluids^ 

 thc»ugh they be apparently fimihir. 



^'OL. II. O Sometimes 



