T. Goodey and a. W. Weldings 
541 
When a preparation of material from the mouth is first examined it 
is not at all easy to pick out the amoebae especially if there are large 
numbers of polymorphonuclear leucocytes present. After a short time 
however one’s eye becomes accustomed to the field and one can then 
pick out from the vast numbers of round bodies certain ones which 
have a denser appearance and a brighter green shimmer than the rest. 
These are the amoebae and if they are examined under the high power 
it will be found that they appear quite different from the polymorpho¬ 
nuclear leucocytes, in which it is often possible to distinguish the lobed 
nucleus surrounded by finely granular protoplasm. 
If examined on the warm stage an amoeba will soon be seen to send 
out small lobose pseudopodia of clear ectoplasm in various directions 
in which case it will not progress much in any given direction. One 
large pseudopodium may be extruded and the amoeba will then take 
on a “limax” like appearance (PI. XX, fig. 1) and the movement will 
be chiefly one of translocation. 
As already mentioned the ectoplasm is hyaline in appearance in the 
pseudopodia, whilst the endoplasm is coarsely granular and is made up 
very frequently of a large number of vacuoles, some of which appear 
to be empty whilst others contain inclusions of various sizes and shapes. 
If a preparation showing actively motile amoebae is examined for 
any length of time, half to three-quarter’s of an hour, on the warm 
stage it will be observed that as an amoeba moves about, its posterior 
end frequently becomes entangled in clumps of bacteria and poly¬ 
morphonuclear leucocytes. The majority of these adherent bodies 
appear to be a hindrance to its continued progress, and the organism 
seems to be trying to get rid of them; the polymorphonuclear leuco¬ 
cytes especially seem very sticky. 
On two occasions we have observed a small round homogeneous 
body, which we have taken to be of the same nature as one of the larger 
food bodies, become attached to the posterior end of an amoeba and 
instead of being cast off after a time, the amoeba has gradually taken 
the -body into its endoplasm. We have never observed the intake of 
a polymorphonuclear leucocyte in this manner nor have we ever seen 
anything in our stained preparations suggestive of a whole ingested 
polymorphonuclear leucocyte within an amoeba. 
There is no contractile vacuole. 
We agree entirely with Craig when he says that in the vast majority 
of cases the nucleus is invisible in the living organism. On only two 
or three occasions have we satisfied ourselves that the round body 
