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MONTGOMERY. 
[Vol. XV. 
wanders out of the nucleus into the cytoplasm, where it slowly 
decreases in size. 
Hermann (’ 97 ) figures (Fig. 20 ) a spermatogonium nucleus of 
Scyllium containing a single and a double nucleolus ; the latter 
consists of two apposed spheres, which differ chemically and 
dimensionally. 
Korschelt (’ 97 ) maintains his previous opinion (’96) of the 
chromatin nature of the macrosomes of the nuclei in the 
spinning glands of caterpillars, in answer to the criticism of 
Meves (’ 97 ) (reviewed immediately below). Korschelt employed 
the Ehrlich-Biondi stain with increased strength of the methyl 
green, and thereby obtained a coloration of the macrosomes 
and microsomes the very opposite of that procured by Meves. 
“ Ob man iiberhaupt achromatische, chromatische Substanz und 
Nucleolen in alien Kernen so scharf auseinanderhalten kann, 
wie dies vielfach geschieht, ist mir hochst zweifelhaft. Wenn 
man in verschiedenen Zustanden der Kerne Nucleolen auf- 
treten und wieder verschwinden sieht, wird man annehmen 
miissen, dass sie sich aus den sogenannten achromatischen oder 
chromatischQn Substanzen des Kerns, vielleicht aus beiden 
herausbilden. So konnen sich moglicher Weise auch die von 
mir als Makrosomen bezeichneten Theile in Nucleolen umbilden 
und das von Meves angegebene Auftreten von Vacuolen in 
ihnen wiirde damit seine Erklarung finden.” 
Meves (’ 97 ) contends that the microsomes in the spinning 
glands of caterpillars, which Korschelt regarded (’96) as lanthanin 
granules, are chromatin; and what Korschelt regarded as chro¬ 
matin granules (i.e., the macrosomes) are nucleoli. Meves 
employed the usual formula of the Ehrlich-Biondi stain (Heiden- 
hain’s receipt), and finding that the macrosomes thereby become 
stained red, concludes from this reaction their chromatin nature. 
Stauffacher (’97) finds in the aster stage of the mitosis of one 
of the pronephral cells of Cyclas , that the nucleolus still persists 
intact in apposition to the spindle fibers. 
Wheeler (’97), maturation of the ovum of Myzostoma: this 
object, previously described by the author (’ 95 ), is here more 
fully described with the addition of figures. A remarkable 
mode of formation of nucleoli in the pronuclei is described ; 
) 
