| larva. 
116 EVOLUTION AND DISEASE. 
scope and cataract needle dividing them into two, three, 
or four pieces. Detailed accounts of six experiments 
are given in which the ova were simply divided, cut into 
three portions, or quartered. The results of these experi- 
ments were as follows :— 
1. Development continued in the divided pieces. 
2. The smaller the piece the slower the growth of the 
3. The smaller pieces tended to form incomplete 
individuals and inclined towards monstrosity. 
These observations are valuable, for it must be borne 
in mind that the growth of a morula (segmented ovum), 
after artificial division, differs very much from the forma- 
tion of a hydra out of a piece cut from an adult hydra. 
From Syphonophora we may pass to worms. In 1828 
Dugés? presented to the Académie Royale des Sciences, a 
paper entitled, “ Recherches sur la Circulation, la Respira- 
tion et la Reproduction des Annélides a Branches,” 
which contains the following remarks relative to the eggs 
of the worm Lambricus trapezoides ;— 
“The first of these eggs which I opened embarrassed 
me much. I saw escape with a glairy material a living, 
white, soft, transversely wrinkled, vermiform animal, 
composed of a body terminated by two appendages 
marked from right to left by a regular spiral. It wasa 
monster formed of two individuals joined together, fused 
in a part of their length, as I have since observed in 
others but with less symmetrical conformation. In each 
egg I have constantly found plunged in the same 
albuminous jelly, either two germs, two cicatricula, or 
* “ Annales des Sciences Naturelles,” tome xv. p. 248. 
