[Vol. 8, 1921] 
356 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
BIBLIOGRAPHY 
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— —— ——, (19). Die Kolloide in Biologis und Medisin. 2 Aufl. (cf. pp. 108-112, 
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a 
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————————, (22). Ameboid bodies associated with Hippeastrum mosaic. Science 
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Reichert, E. T. and A. P. Brown. ('09). The differentiation and specificity of 
corresponding proteins and other vital substances in relation to biological 
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the virus of the “peste des poules,” this investigator compared the ultrafiltration 
of this disease agency with hemoglobin and serum albumin, all filtrations being 
made through a graded series of collodion membranes. It was determined that the 
particles of the virus were smaller than hemoglobin and about the size or somewhat 
smaller than serum albumin. In discussing actual sizes, however, he seems to con- 
fuse the sizes of colloidal particles of hemoglobin with the sizes of molecules. Never- 
theless, his conclusion is to the effect that this virus cannot be formed of cells similar 
to those of plants and animals at present known. 
