14 



was kept covered in a warm room (65 to yo° Fahr.), and occa- 

 sionally placed several hours in the sun. On October 14th, three 

 weeks from placing them in water, they commenced to hatch. 



Exp. 16. June nth, 1885, placed two mature Syngami in a 

 small glass dish of water, and kept them in a room where they 

 were not exposed to the direct rays of the sun. On June 28th, 

 seventeen days from the time they were placed in water, they 

 commenced to hatch. 



As will be seen from the above experiments, the time required 

 for the eggs to hatch varies under different circumstances. When 

 they have been mature for several days and kept moist and in a 

 moderately warm place they will undergo segmentation and the 

 embryo commence to form. If these eggs are now placed in 

 water in a warm place it will take but a short time for the em- 

 bryos to hatch. Again, eggs kept in moderately warm water 

 will mature their embryos much quicker than those kept cooler. 



Exp. 17. December 1st, 1884, placed several embryos found 

 coiled up in the muscular sac of the segmental organs of the 

 earthworm, in a small glass dish of water and kept them loosely 

 covered, in a warm room. These embryos were thought in the 

 beginning of the investigation to be those of SyHganuis, and this 

 method was adopted to see if any growth or development of 

 structure would take place in water, whereby we might decide 

 the question. In from five to seven days they grew to many 

 times their original length, and were developed into male and 

 female. A small number of eggs were also seen in different 

 stages, within the oviducts and scattered about the bottom of 

 the vessel. These worms correspond with the description and 

 figures in the Micrographic Dictionary under the head of Augtiil- 

 lulidiac, and are thus excluded from being the embryos of Syn- 

 gamus. 



Exp. 18. Several embryos taken from the intestinal canal of 

 the earthworm, where they were found surrounded by mucus, 

 were placed in a glass dish of water and kept, as in the fore- 

 going experiment, seven days. These embryos, after a few 

 hours, coiled themselves up at the bottom of the dish, and for 

 the most part of the time remained in this condition, occasionally 

 uncoiling and moving about a short distance. No growth or 

 development of structure took place. These embryos correspond 

 in size and structure with those hatched from the eggs of Syn- 



