590 Dr. DavuBEny on a certain Kind of 
in the analogous thermal spring of Digne in the same depart- 
ment. I met with it, as at the former locality, wherever the 
water was allowed to drop upon the floor of the bath. 
When examined under Amici's microscope, it presented a 
fibrous structure, the filaments being so interlaced as to form a 
kind of network. ‘These filaments by a stronger magnifying 
power exhibited the same appearance of tubes with granulations, 
as those did from the former locality. 
Among the hot springs which are so abundant in the Py- 
renees, I collected several samples of this same organic matter, 
and remarked, that when the spring from which it had been 
obtained was impregnated with sulphuretted hydrogen, the ap- 
pearances approached those already described. 
Thus, at Arles in the departement des Pyrenées Orientales, 
south of Perpignan, there occurs an abundant deposit of or- 
ganic matter, which, examined through the microscope, pre- 
sented a tubular structure, in which, however, the granulations 
were not very distinguishable. 
At Barege, one of the most powerful of the sulphureous 
springs, a substance is collected in the pipes and reservoirs 
receiving the water, which seems to consist of a cluster of little 
transparent irregular vesicles, having interspersed certain dark- 
coloured roundish bodies, that appears like the same vesicles, 
rendered opake by some kind of matter which fills their in- 
terior. As, however, there were signs of decomposition in this 
matter at the time when I was first enabled to submit it to the 
microscope, I considered it useless to obtain a drawing of the 
appearances it then presented,—and I allude to it at present, 
only in order to establish the general position, that the glairy 
or mucous-looking matter called baregine, which is met with in 
so many warm sulphureous springs, derives its origin from the 
growth of Conferve. 
This 
