(1700) In this glass bulb I put ten cheese larvae , of the largest size , and then I put two or three times burning sulphur , approximately the breadth of the back of a knife , on a thin hemp stick in the glass bulb and let the sulphur burn out there ; and I observed that this burning sulphur ( as it appeared to me ) had not bothered the said larvae .And when this glass bulb had stood thus for about one hour ( after the burning of the sulphur therein ) , I brought the opening of the glass bulb near to my nose , and then I still perceived the smell of sulphur fairly strongly .Just as we know that when we set sulphur on fire , this sulphur does not disintegrate , but is merely divided into such small particles that they are not visible to us , so it became apparent to me with this burning sulphur , for I saw an incredible number of extremely small sulphur particles , which appeared round to me , adhering on the inside to the glass .