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SUMMARY OF CURRENT RESEARCHES RELATING TO 
rhythm, and coincident with eruptive and quiescent periods of activity. 
The average rate increases with a rise of temperature until a maximum 
is reached at about 25°, after which it decreases. It seems that the 
temperature affects the rate only through its effect on the rhythmical 
processes which condition locomotion. J. A. T. 
Iodamoeba of Man. — W. H. Taliaferro and E. E. Becker (. Amer . 
Journ. Hygiene , 1922, 2, 188-207, 2 pis.). A study of Iodamoeba 
williamsi and its cysts (“ iodine cysts ”). In the nucleus of the 
Iodamoeba williamsi x 4300. 
Figs. 1, 2.— Active amoebae stained with iron-haematoxylin and eosin. The 
peripheral granules of the nucleus appear as a segmented ring surrounding 
the karyosome. 
Fig. 3. — Precystic amoeba stained with Mann’s methyl-blue eosin mixture. Note 
the peripheral granules around the karyosome. 
Fig. 4. — Active amoeba. Note the linin strands running from the karyosome to 
the nuclear membrane. 
motile amoeba of the “ iodine cysts ” there is a well-defined nuclear 
membrane, a large central karyosome, a single layer of peripheral 
granules (“ peripheral chromatin ”) which surrounds the karyosome,. 
