JiUCtEI OF ANIMAt AND VEGKTABLE CELLS. 131 



' Sitzungsber, der Wiener Kais. Academie der Wissenschaften.' 

 Bd. Ixvi, iii. April, 1872. 



10. T. Oellacher. — "Beitrage zur Entwicklungsgeschichte der Knochen- 

 flsche nach Beobachtungen am Bachforelleaei," • Zeitschrift fiir Wiss. 

 Zoologie.' Bd. xxii, 4. 



11. Idem. — Bd. xxiii, 1. 



12. (zoe^^e.— "Beitrage zur Entwicklungsgeschichte der Wirbelthiere," 

 • Max Schultze's Archiv.' Bd. ix, 4-. 



13. Romiii. — " Studi di Embriologia. Rivista Clinica di Bologna, Decem- 



ber, 1873," quoted in ' Jahresber. iiber d. Leistungen und Fortschritte 

 in d. Auatomie u. Physiologic.' Eur d. Jalir, 1873, p. 95. 



14. F. M. Balfour. — " A Preliminary Account of the Development of the 

 Elasmobranch Eishes," ' Quarterly Journal of Microscopical Science.' 

 October, 1874. 



15. E. H. Haeckel. — 'Jenaische Zeitschrift, vol. ix, die Gastrula und die 

 Eifurchung der Thiere.' 



Recent Researches on the Nuclei of Animal and Vege- 

 table Cells, and especially of Ova. By John 

 Priestley, Assistant Lecturer on Physiology, The 

 Owen^ College, Manchester. (With Plates XI & XII.) 



While much important knowledge of the protoplasmic 

 bodies of cells had rewarded the labours of histological 

 workers, only a few ascertained facts, together with various 

 ill-supported theories, existed respecting the intimate nature 

 and the functions of the nuclei. During the present decade 

 however, much of the energy of research has been directed 

 to repair this deficiency; and the body of fact which we possess 

 concerning nuclei is rapidly gaining in size and solidity. 

 Some of the publications which have assisted in the impulse 

 are those of which an account is now to be attempted. 



Notwithstanding some marked diversities of theory, the 

 general agreement in the statements of the various authors 

 seemed to suggest that it would be of advantage to the 

 English reader, and certainly fairer to the authors them- 

 selves, to give firstly a separate, brief resume of the work 

 of each, and afterwards to collate the various statements and 

 indicate their points of divergence. 



The historical notices, and all the references, are given on 

 the responsibility of the several writers, since it has been 

 impossible from many causes to check them. They are for the 

 most part taken from the admirable critical article of Hertwig. 



Among the first of the works referred to is that of Pro- 

 fessor Auerbach, of Breslau, published in 1873-4.^ In it 

 there is recorded a very extensive series of observations 

 1 ' Organologische Studien.' Breslau. 



