128 
L. Digby 
that “sehr entschieden läßt das Fortbestehen der Chromosomen in dem 
Enhezustand des Kernes auch durch die Fälle sich stützen, in welchen 
die einzelnen Chromosomen durch eine dichtere Stelle im Gerüstwerk 
dauernd sich markieren” (p. 497). Discussion centres round this State- 
ment. The individuality of the chromosomes can be recognised in resting 
nuclei accordmg to the degree of dissohition sustained by the chromo- 
somes of the preceding division. Disintegration niay be so slight as to 
allow of identification of the chromosomes with the deeply staming bo- 
dies of the succeedtng resting phases ; it may however be so complete as 
to obüterate aU visible chromosome mdividuality. Between these two 
extremes all grades of intemiediate indications of chromosome identity 
may occur. Martixs (31) and Davis (7) have shown that the chromatic 
bodies of the resting stage are identical with, or are certainly derived from, 
the chromosomes of the preceding telophase. Frisexdahl (15) States 
that the paired ‘Chromatinkörner are transverse segments of the lon- 
gitudinaUy spht chromosomes of the preceding telophase. A somewhat 
siniilar condition was found in Galtonia (9) though the facts, as to the 
origin of the paired chromatic portions. were not so definitely ascertain- 
ed. Gregoire (20) described alveohsed chromatic concentrations in the 
presynaptic stages of certain plants, and considered theni not as ‘gamo- 
somes’ but as “troncons de bandes chromosomiques”. Or again the chro- 
mosomes at telophase may resolve themselves into elementary reticula, 
as described by Gregoire (18) and by Oi’ertox (42), and these retain 
their independence during the resting period. and reconcentrate during 
prophase. In Periplaneta amerkana Farmer and Moore (11) have ob- 
sen ed cloudy areas which represent the future chromosomes, and gra- 
dually condense to fonn theni. Complete chromosome disintegration is to 
be found in certain resting nuclei, as in some cereals (37 ) and Primulas 
(10), and consequently these resting nuclei possess little visible chromatic 
Contents. Kakao (37) describes the resting nuclei as being slightly 
darker than the surrounding cytoplasm. and the chromatic bodies as gra- 
dually niaking their appearance at the approach of prophase. In Primula 
the nucleolus exudes droplets of its substance which become chromatic 
and thereupon resemble defmite chromatic bodies. 
The above observations demonstrate that there is a wide ränge in 
the degree of dissohition exliibited by the chromosomes at telophase, 
and this results in varied concentrations of chromatic elements in the 
ensuing rest. In some cases the identity of the chromosomes remains 
more or less recognisable, whilst in others it is completely obhterated, 
though invisibUity need not involve loss of real identity. 
