M WATJUK TUMIVAJJ TU JLSJjUUJJ." 



205 



the water of our salt-marshes before St.-Hilaire and Turpin. As I was 

 at that time employed in teaching Natural History in the Royal Col- 

 lege of Montpellier, where I had among my pupils several youths who 

 have since become distinguished masters themselves (Louis Figuier, 

 Amedee Courty, and Henri Mares, for instance), I too had a desire to 

 study the curious phenomenon of the reddening of water, and to this 

 end I visited the salt-works of Villeneuve, two or three miles distant 

 from Montpellier. The water there was then of a very decided red 

 color. I collected on the spot some samples of the water which 

 looked most like blood, and also of water which, being less briny 

 than this, was also of a fainter red color. Under the microscope the 

 water collected in the various compartments exhibited myriads of 

 minute creatures, with oval or oblong bodies, often compressed in the 

 middle, but sometimes cylindrical. Very young individuals were 

 colorless, those a little older were greenish, and the adult were of a 

 deep red. The mouth had the form of a conical prolongation, and was 

 retractile; they were eyeless, and the stomach and anus could not 

 be clearly made out. 



Fig. 6. 



Fig. 5. 



0, 



Dead Monads, colorless. 



Part of the Digestive Tube of Artemia Salina, 

 in which are seen (a, a) dead but not digested 

 monads, and (&, b) cubical salt-crystals. 



With a high-power microscope I was able to see in the anterior 

 part of these supposed protococci two long, flagelliform, and perfectly 

 transparent processes which they kept in rapid motion, and by means 

 of which they swam about in the drop of liquid spread out on the slide 

 of my instrument. There was no longer room for doubt. The proto- 

 cocci and hcematococci of Messrs. Dunal, St.-Hilaire, and Turpin, were 

 animals — true monads, and I gave them the name of Monas Dunalii, 

 in honor of my preceptor, Prof. Dunal. He was the first to suspect 

 the true cause of the red color of the Mediterranean salt-marshes ; but 

 he had only an indistinct insight into the matter. He examined the 



