748 THOS. H. MONTGOMERY, JR. 
My present paper gives results that are thoroughly confirma- 
tory of the idea of the continuity of the chromosomes, a view 
that I have consistently tried to support. In Euschistus there is 
no rest period in the spermatocytes, but the boundaries of all 
the autosomes may be readily distinguished from the early growth 
period through both maturation divisions into’ the early part of 
the histogenesis. This is not only a continuity of number but 
also—and this is more important—one of size differences. This 
subject has received so much attention in preceding papers of 
mine (especially those of ’00, ’01, 06, 10a) that there is no gain in 
another discussion of it here. 
On the matter of the mechanism of the reduction of the chro- 
mosomes there is a very voluminous literature, as every one 
knows to his cost who has tried to keep abreast of the discussion. 
Fortunately Grégoire (’10; compare also his earlier study of ’05) 
has recently published an excellent comprehensive critical review 
of this whole literature through 1909, so that I do not need to go 
over the ground in this place but will refer the reader to Grégoire’s 
work as the most thorough discussion of the question. Below 
I give a concise tabulation of the chief opinions relating to the 
phenomena of reduction of the autosomes, arranging these in 
somewhat different form from that of Grégoire, and mentioning 
for each view simply its main founders. In this tabulation I do 
not include the “interpretations spéciales de nature complexe”’ 
which Grégoire reviews on pp. 269-2738 of his last study; these are 
explanations offered by Hicker (and his students), by Schaefer, 
Otte, Wilke and Marcus, all of them differing rather markedly 
from other modern opinions, and none of then as yet particularly 
corroborated. 7 
6 Grégoire seems to have omitted only one important paper on the subject, 
that of Guyer, which was dated 1900 but does not appear to have been published 
until two or three years after that time. Stomps has issued, since the appearance 
of Grégoire’s work, a study of considerable interest upon the maturation phenom- 
ena of Spinacia. . 
7 The most important of these explanations is perhaps that of Hacker (’04, ’10). 
But his idea of a teleutosyndesis, a conjugation of autosomes during or after the 
second maturation mitosis, are in complete disaccord with the work of Riickert, 
Lerat, Nichols, McClendon and others on crustacean gametogenesis. This dis- 
