JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATES XI AND XII, 



Illustrating Mr. John Priestley's Paper on Recent Researches 

 on the Nuclei of Animal and Vegetable Cells, and 

 especially of Ova. 



PLATE XL 



{The Figures are from AuerhacKs * Organologische Studien.') 



Fig. 1. — Nuclei and cells from the carp's liver. 



a — d. Nuclei in their natural condition, e — g. Isoliited nuclei in the con- 

 dition of water-shrinking, with expressed hyaline droplets. /. Internal 

 swelling of nuclei, h, i. Isolated nuclei in concentrated solution of NaCl. 

 k. Isolated nucleus in concentrated solution of acetic acid. m. Water- 

 shrinking of nucleus within its cell. 



Pig. 2. — Nuclei from the gastric and intestinal cylindrical epithelial cells 

 of the frog. 



A. Natural condition, b. Under the influence of very dilute solutions 

 of NaCl. c. Under the influence of pure water. 



The remaining figures represent the ova of Ascaris nigrovenosa iu a 

 strongly compressed condition. 



Pigs. 3 — 7. — Formation of yolk-membrane and primary cleavage-nucleus. 



Figs. 8 — 11. — Formation of bistellate figure and segmentation into two. 



Figs. 12, 13. — Segmentation into four. In the course of elongation and 

 formation of the bistellate figure (fig. 12) the positions of the segments 

 change, from superior and inferior, to supero-lateral and infero-lateral. 



Fig. 21.— Exceptional elongation of the lower of the nuclei in fig. 11 in 

 a direction with, instead of across, the long axis of the ovum, and conse- 

 quent abnormal disposition of the four resulting segments. 



