C. Dobell and M. W. Jepps 
325 
The mean sizes of the cysts calculated from these figures and expressed 
in microns are as follows: 
Mean size of cysts in saline = 12-99p, or approximately 13p. 
„ „ iodine = 12-86p, ,, ,, 12-9p. 
,, ,, balsam = 12-04/x ,, ,, 12p. 
,, „ euparal = 12-19|U, ,, ,, 12-2p. 
The differences in the dimensions of the cysts measured in different 
media are very clearly shown by the curves^ (Fig- 2). It will be noted 
that the curves representing the measurements of the cysts in euparal 
and balsam coincide very nearly, each having a single apex at 12/x. The 
^ In tlicse curves, am! in all tlic others in this paper, tlic numbers of cysts measured are 
shown on the ordinates, and the dimensions of the cysts in microns along the abscissae. 
