286 ESSAYS AND OBSERVATIONS 



with an infufion of tea, though not in the 

 fame degree as with the galls, 



9. When oleum 'viiriolij or Jpir it us vU 

 trioli, is dropt into it, no efFervefcence, or 

 change of colour, is produced-. 



10. With oleum tartari pfr deUqiiium^it 

 made no efFervefcence ; but light green 

 clouds gathered, and were fufpended, in 

 the middle of the water; and a great 

 number of fmall air-bubbles, like parti- 

 cles of quick-filver, appeared adhering to 

 the bottom of the glafs, to its fides, and, 

 upon the furface of the water, multitudes 

 of the like air-bubbles were intermixed 

 with the green clouds : After (landing a- 

 bout an hour, a great many of the air- 

 bubbles difappeared, and the clouds in 

 the middle of the water grew thicker, and 

 of a darker green, and afterwards preci- 

 pitated. 



11. An aqueous folution of ficcbarum | 

 Saturniy turned it a little whitifh, but not 

 fo much as it did the river-water ; and 

 much lefs than it did tiie river-water, 

 when there was a very little fea fait diflbl- 



ved 



