VOL. XXIII.] l-HILOSOPHICAL TRANSACTIONS. 53 



tion on the ends of the twigs; and I was confirmed in that opinion when I per- 

 ceived the next day in the morning, after the water had been 48 hours in the 

 glass-tube, that most of these round bubbles were ofF the twigs, and that a 

 very few of the animalcula were got upon the twigs, and remamed there im- 

 moveable while I made my observations. 



Twelve hours after this I could not see that the branches were grown larger ; 

 but I then observed that several of the small twigs were again invested with 

 round bubbles, and an animalculum that was about 50 times as large as one of 

 the bubbles, was running on one of the branches ; and as the end of one of the 

 twigs, where that animalculum had been, was again laden with the said bubbles, 

 I concluded, though I had no ocular proof of it, that the said animalculum had 

 dropped her young ones there. 



On the 6th of August I took another glass-tube, of above a foot long, and 

 an inch in diameter, one end of which was hermetically sealed, that there 

 might be no cause of suspicion that these branches or twigs proceeded from the 

 cork; and having rinsed it two or three times, I set it on my desk, and viewed 

 it several times, but could perceive no branches, till after the water had stood 

 above 40 hours in the tube; after which I took a microscope, and fastened it 

 to the tube, to see whether the branches grew any larger after the first disco- 

 very of them; but I could not perceive any alteration. Now I could see, on 

 the extreme parts of the twigs, 3 or 4, or sometimes 5 round bubbles, like 

 roses, by one another ; and when one of these branches, which was only fas- 

 tened to the glass by its thicker end, came to be removed by that small motion 

 into which I put the water, all the 5 small twigs were likewise put into motion, 

 and the same motion was likewise imparted to the bubbles, though some of their 

 stalks were so exceedingly small, that I could not see how they were joined to 

 the said twigs. 



I poured out the water very gently from the glass-tube, that the branches, 

 which were fastened by their stems only to the sides of the glass, while their 

 twigs were kept in a continual motion by the water, might lie along on the 

 glass, to have them better drawn and represented. In fig. 7, pi. 2, abcdef 

 represent the particle as it lies on the side of the tube; a shows the stem or 

 root of the branch by which it was joined to the sides of the glass. 



Here it is seen what a vast number of branches and twigs there are in this 

 single figure, which indeed appears irregular upon the paper; but in the water, 

 where they were unravelled, and could play freely, it was a very agreeable sight, 

 being in colour like oak, and in several places beset with round bubbles, just 

 as if they were composed of such particles, g and d represent some of the 

 particles of the figure of a rose, which seem to consist of round bubbles, as 



