l66 PHILOSOPHICAL TRANSACTIONS. [aNNO 1704. 



that it must be taken out, they always find on the bottom two cakes of different 

 matter, not mixed with each other. The undermost is a sort of aes caldarium, 

 or gleiken spisse, and the uppermost a marcasite. The grass and fruits growing 

 about the place where such a work-house stands, are commonly poisoned by 

 the arsenical smoke, so that neither cattle nor men can feed upon them with 

 safety. 



Plate 6, fig. 18, IQ, the furnace where the cobalt is roasted, and the arsenic 

 separated; a the furnace to roast the powdered cobalt ; b the chimney receiving 

 the arsenical smoke; ccc the channel of stones to collect the arsenic. 



Fig. 20, the furnace for melting the cobalt into a glass; aaaa the holes 

 where the melting pots stand. The large holes where the pots are put in are 

 shut up with brick, and a small one, bbbb, left open, where the glass is taken 

 out with the iron ladle. 



Fig. 21, represents two grinding-stones to grind in water. 



Observations of the spots that appeared on the Body oj" the Sun in June and July, 

 1703. By Capt. Stannyan. N° 294, p. 1756. 



On Saturday, May 15, 1703, at sun-set, there appeared two suns, the mock 

 sun above the real one, which was then only 5 degrees above the horizon. I 

 took a good 7-foot telescope, with a small aperture, and soon discovered a solar 

 spot near the sun's centre, which I designed to observe more exactly the day 

 following, but it proved cloudy. Monday, May the 17th, at 6 o'clock in the 

 morning, the spot was advanced considerably towards the sun's western limb ; 

 it seemed of a strong consistence, very compact, resembling a face, and was 

 distant by noon from the anterior limb of the sun's disk 6 1 seconds of time. 

 May 18, at noon, the spot was 46 seconds of time distant from the preceding 

 limb. May IQ, the solar spot was within 33 seconds of time of his western 

 limb. May 20, at noon, the spot was arrived within 21 seconds of time of the 

 preceding limb, moving nearly in a straight line, and intersecting the parallel 

 of declination passing through the sun's centre. May 21, we had no sun-shine. 

 May 22, at 7 o'clock in the morning, the solar spot was advanced very near the 

 limb of the sun's disk. May 23, at 6 hi the morning, the spot was got to 

 the very edge of the sun's disk, resembling a barley corn, lean and slender, and 

 of a duskish colour, wanting only its own shortest diameter of the sun's limb. 

 At 8 o'clock I observed it again, also at 10 and at 12. At 2 it was slid into 

 the very circumference, and hardly visible, had I not kept an eye upon it all the 

 day long; about 3 in the afternoon it totally disappeared. 



On Monday, June the 7th, 1703, at 3 o'clock in the afternoon, I discovered 

 the same spot, as I supposed, which I had seen go off the sun's disk on May 



