Igol] CURRENT LITERATURE 73 
which give a slight reaction for “masked iron” and organic phosphorus, and 
therefore are considered analogous tochromatin. No specialized chromatin- 
holding structure in the shape of a nucleus was found in any of the forms of 
Beggiatoa studied. In his studies on the yeast cell, Macallum finds that the 
cytoplasm takes a stain with haematoxylin and gives a diffuse reaction for 
“‘masked iron’’ and organic phosphorus. In addition to the chromatin-like 
substance diffused throughout the cell, there is usually present a homogeneous 
corpuscle. This is not considered to be a nucleus, although held to be such by 
other investigators. The chromatin-like substance in Saccharomyces is 
soluble in artificial gastric juices, thus differing from the chromatin of the 
higher plant and animal cells. The paper is illustrated by a colored litho- 
graphic plate. It is a valuable and highly interesting addition to the litera- 
ture of this important problem.—A, A. Lawson. 
