4 2 



HARGITT. 



[VOL. I. 



In Fig. 9 is shown the coalescence of two Medusae by their 

 oval margins. This was usually the most easily performed of 

 any of the experiments upon the Medusae, and union was 

 rather more prompt if any difference was noticeable. As will 

 be seen from the figure, fusion was not entire in this case, a 



small mouth-like opening remaining on 

 one side through which aeration of the 

 interior was made possible, and by means 

 .br of which by contraction the united indi- 

 viduals were able to move about in the 

 water. It should be noted in this con- 

 nection that upon stimulation coordinated 

 movements were produced, and in a few 

 instances even apparently spontaneous 

 movements were clearly recognized. I have said that this 

 action was apparently spontaneous. It is not impossible, of 

 course, that some extraneous stimulus might have been involved, 

 but, if so, it was wholly beyond any ordinary physical detec- 

 tion, and was distinctly recognized by several persons to whom 

 it was pointed out. 



In these experiments, in a few cases, the specimens united 

 completely throughout the entire margin, but with the result 

 that the specimen died within a comparatively short time, pre- 

 sumably from inability to secure aeration of the portions where 

 metabolism was most active and aeration most imperative. 



FIG. 



FIG. 10. 



! [G. i i 



Figs. 10 and 11 show a method of aboral grafting made upon 

 a considerable number of specimens, but uniformly without 

 permanent success. As will be noted .in Fig. n, the points 

 of contact were slightly scarified, or in some cases portions 

 excised with sharp scissors, in order to favor coalescence of 



