802 
Kemp.—On the Question of the Occurrence of 
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Mitt. 59, 1902. 
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Gesell., xxxviii. 5, 1910. 
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Archiv f. Entwickl. d. Organ., Leipz., 1909. 
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Jahrb. wiss. Bot., xliv, 1907. 
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Gesell., xxvii. 8, 1909. 
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Jahrb. wiss. Bot., xxxviii, 1903 ; xxxix, 1904. 
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Pollenmutterzellen und deren Produkte bei Larix dahurica. Bull. Intern. Acad. Sci. 
Cracovie, 1906. 
\ 
EXPLANATION OF PLATES LXVI AND LXVII. 
Illustrating Miss Kemp’s paper on ( Heterotypical Reduction ’ in Somatic Cells. 
All drawings were made with the camera lucida, under a 2 mm. apochr. homo. imm. Zeiss 
N. M. 1.40 with comp. oc. 18. x 2,250. Figs. 1, 2, and 3 were drawn under a T V Leitz Wetzl., 
with 12 oc. Approx, x 1,199. 
PLAT£ LXVI. 
Fig. 1. Periblem cells of Galtonia root after 1 hr. in 0*75 per cent, chloral hydrate and 1 hour’s 
washing in tap-water. Shows fragmentation and scattering of the chromatin throughout the cell, 
and effect of the poison on nuclei at rest and in division. 
Fig. 2. Section of Galtonia root after 22 hours’ growth subsequent to experiment. One nucleus 
is seen in imperfect division ; another amoeboid in shape; a third broken up into three bodies, 
of which two are in process of degeneration. 
Fig. 3. Row of cells from Galtonia root after 44 hours’growth subsequent to experiment. These 
are of unusual size and contain amoeboid nuclei, from which small portions tend to be cut off. 
Figs. 4 and 5. Irregular equatorial plates from Galtonia root after 5 hours’ growth subsequent to 
experiment: in Fig. 4 the chromosomes are clustered together at the centre of the cell; in Fig. 5 
they are scattered across it. 
Figs. 6 and 7 show conditions arising from Figs. 4 and 5 ; the partially separated groups of 
chromosomes are going into rest; an imperfect cell-plate is seen. 
Fig. 8 shows cell from root of Vicia Faba ; this contains an irregular tripolar division consisting 
of three masses of chromatin of unequal size ; one cell-plate divides the large from the two smaller 
masses. 
Figs. 9 and 10 show transverse and longitudinal views of further stage of tripolar division ; the 
masses of chromatin and cell-plates are again somewhat irregular. 
Fig. 11 shows a group of three cells from root of Vicia Faba, evidently arising from tripolar divisions 
similar to the above ; a connexion between two of the cells persists through the dividing wall. 
