PLANARIA FLEXILIS. 21 



kept several months, appeared in unusual 

 agitation on the twenty-fourth of Decem- 

 ber ; and then a small spot of very minute 

 eggs, as I conceived them, was seen on the 

 side of their glass, near the surface of the 

 water. Between that day and the tenth 

 of May, the Planarise continued laying, un- 

 til the eggs amounted to thousands pro- 

 duced by each. They were preserved with 

 much care, but I could not be sensible that 

 any young were hatched ; and at length I 

 conjectured that many of the eggs were de- 

 voured by the old ones. Circumstances 

 have prevented a repetition of this obser- 

 vation, which demands to be further illus- 

 trated, as the nature of the Planariae was 

 affected by the heat of an apartment, and 

 they were not isolated. For a long time, 

 the original spot was resorted to ; the eggs, 

 if they may truly be considered such, 

 were afterwards affixed to various other 

 parts of the vessel. Whether more would 

 have been produced after the tenth of May, 

 is uncertain, as all the Planariae perished 

 about that period. A premature season 



