2^8 Oa a Uei SuhJiatiCe ohfet'vi-i 



I beheld partly large and partly fmall bubbles, refcmbUn^ 

 bright fpeeula, furrounded by a dark rim or margin, which 

 ■«rcre fometimes like fmall rings (i,i), and fometimt* 

 broader ; fa that the bright fpeculum in the middle formed 

 the fmaller part {;z,i). Everywhere around were fecn an 

 immenfe number of minute globules of the fize as reprc- 

 fented in the figure; confequently aftonifliingly fmall in 

 regard to the fpccula, but fimilar to them in this refpeft, 

 that they had a bright point like a fpeculum in the middle. 

 At firft, as far as I could obferve, they were black, or of a 

 dark colour, the bright point excepted ; but the red colour 

 afterwards fhewcd itfelf very clearly. In thofe that were 

 red, the bright point was always feen ; but this was not 

 always the cafe with the dark ones. All thefe roimd bodies 

 or globules appeared at firft, though very feldom, to have 

 feme life and motion, but afterwards they entirely loft all 

 movement ; and this was the cafe in particular with the 

 red, which feemed entirely lifelefs. I could alfo clearly ob- 

 ferve, that the red matter, which depofited itfelf in abun- 

 dance at the bottom of the veflel, was nothing elfe than an 

 affemblage of fuch round globules which had loft all life and 

 movement. Befides thefe round globules with a bright 

 point in the middle, I faw in the pellicle on the water, as 

 well as in the water itfelf, another kind of living animals in 

 greater numbers (3), which were fhaped like fmall fifli, and 

 perfeilly ftmilar to the Cercarits virides of Muller *, which 

 produce the green covering on ftagnant water; but with this 

 difference, that they were no larger than they are reprefent- 

 «d in the figure, and that they had not a green but a dark 

 appearance. I obferved alfo, though with difficulty, that 

 the tail was forked ; and that fome of them, clofe to the 

 tail, had a bright point or reflection, while the body befofe 

 was not brighter than that of the Cercaria viridis. Thefe 

 tnall animals moved with great alertnefs and vivacity in the 



* See his Animakula irfufoiia^ No. 130, p. 136. 



drops 



