The Identification of Intracellular Structures. 117 



workers of Maclean's type and the cytologist may produce happier 

 results. Maclean does not mention anything of the literature on 

 the mitochondria. 



General Summary. 



There is some considerable difficulty in distinguishing several 

 categories of cell elements. The Golgi apparatus, mitochondria, 

 Yolk, and fat are, or contain, substances often identical and generally 

 chemically allied. For this reason great care must be exercised in 

 any attempt to identify a given cell body, and it is clearly recognized 

 that the mixture of two or more of the above-mentioned elements 

 may lead to confusion. The characteristics of the various elements 

 of the cell, which the zoologist meets, and the manner in which 

 they may be distinguished, has been indicated in tabular form. It 

 is hoped that these Tables will prove useful to embryologists and 

 others who might wish to ascertain the nature of any enigmatic 

 cell body under their notice. Finally, it may be pointed out that 

 such Tables can only be made inclusive and perfectly efficient after 

 criticism and trials by other workers, and I would welcome any 

 suggestions of this kind. 



Bibliography. 



(For a fuller list see the papers of Pappenheiiner, Duesberg, 

 Gatenby, and Hirschler.) 



1. Mann, G. — Physiological Histology. Oxford, 



2. BoLLES Lee. — The Miorotomist's Vademecum. 



3. Leathes, Maclean, Plimmer, etc. — Monographs on Bio- chemistry. 



4. Best. — (Glycogen Staining.) Zeit. wiss. Zool., xxiii. p. 319. 



5. GoLGi, C. — Intorno alia struttina delle cellule nervose. Bol. del Soc. 



Med.-Chir. di Pavia (1878). 



Di un metodo per la facile e pronta demostrazione dell' apparato 



reticolare interne delle cellule nervose. Ibid (1908). 



6. Hirschler, Jan. — Uber die Plasmakomponenten des weiblichen Gesch- 



lechtszellen. Arch. Mikr. Anat., Bd.89, Heft 1. 



7. Jenkikson, J. W. — Vertebrate Embryology. Oxford, 1913. 



8. KoPSCH, F. — Die Darstellung des Binnennetzes in spinalen Ganglien- 



zellen und anderen Korperzellen mittelst Osmiumsaure. Sitzungsber. 

 d.k. preuss. Akad. d. Wiss. zu Berlin. 



9. Meves, F. — Die Spermatocytenteilungen bei der Honigbiene. Arch. f. 



mikr. Anat., Bd. 70. 

 +" 10. Pappenheimer, a. M. — The Golgi Apparatus : Personal Observations and 

 a Review of the Literature. Anat. Eecord, ii. No. 4 (1916). 



11. Granata. — I mitochondria nelle cellule seminali mgtschili di Pamphagus 



marmoratus. Biologica, ii. No. 4. 



12. Terni Tul. — Condriosomi, idiozoma, e formazioni periidiozomiche nella 



spermatogenesi degli Anfibii. Arch. f. Zellforch, Bd. xii. 14. 



13. Champy, Ch. — Eecherches sur I'absorption intestinale et le role des 



mitochondries dans I'absorption et la secretion. Arch. d'Anat. 

 Micr,. xiii. (1911-12). 



