-l.-.N MVMAJiV Of I 1 RRENT RESEARCHES RELATING TO 



chromosdme of the prophase is bivalent, showing two spirally coiled 

 « elementary Btrncturea " or - mitea," each of which is the starting-point 

 of a daughter-chromosome. He follows their history, and offers a strong 

 corroboration of Boveri's theory of the individuality of the chromosomes. 



Nuclear Budding in Tumour-cells.*— W. T. Howard finds that in 

 certain depressed cells, usually giant cells, of some tumours there occurs 

 a Bpecial type of amitosis— a process of nuclear budding. It represents 

 -ion on the part of these cells to a primitive type of nuclear and 

 .til-division common among certain Protozoa, e.g. Podophrya, It affords 

 a ready and simple means of cell regulation and of rapid division and 

 multiplication among such cells. The author suggests that the degener- 

 ation and extrusion of nuclear buds followed by mitosis of the mother- 

 nucleus in tumour-cells is, in principle, comparable to the maturation 

 division of egg-cells. 



Physical Nature of Neuroplasm.! — N. A. Barbieri has come to the 

 conclusion that the neuroplasm in the nerve-cells and nerve-fibres is 

 mobile and fluid. It can be emptied out by compression. Even the 

 extravasated neuroplasm will take on a fibrillar structure if treated with 

 alcohol or formol and stained, but this is an artificial result. Indeed, all 

 the appearances produced by fixatives are artefacts, according to the 

 author. 



Union of Muscle-fibre and Tendinous-fibre.^— E. Retterer and A. 

 Lelievre conclude that there is no special substance, neither sarcolemma 

 nor cement, uniting the muscular-fibre to the tendinous-fibre. At the 

 level of the junction of the two kinds of fibres the dark discs disappear, 

 and the clear bands are continued directly into the substance of the 

 tendon. 



Involution of Bursa Fabricii.§— J. Jolly gives a precise account of 

 the involution or degeneration of this interesting transitory organ. The 

 essential point is the gradual disappearance of the lymphocytes and the 

 replacement of the lymphoid tissue by fibrous tissue. The organ becomes 

 hard, and there is sometimes an accidental necrosis. 



Epidermic Fibrils in Chick. ||— Jean Firket describes the occurrence 

 of cells quite full of fibrils in certain parts of the epidermis of the chick, 

 namely, in the primordia of the beak and the feathers. Similar epidermic 

 fibres have been described before, but the author has studied their 

 development, and finds that they are formed at the expense of the 

 '•liondriosomes of the embryonic cells. 



Innervation of Heart in Reptiles and Batrachians.H— M. Fedele 

 has Btudied this in Lacerta muralis, Elaphis quadrilineatus, Zamenis 

 viridiflavus, and in newts, frogs, and toads. He describes the nerve 



* Festschrift Richard Hertwig, i. (1910) pp. 1-18 (3 pis.). 



f I omptes Rendu?, clii. (1911) pp. 1267-9 (lfig.). 



; I .R Soc. Biol., lxx. (1911) pp. 474-6. || Tom. cit., pp. 564-7. 



§ Anat. Auzeig., xxxviii. (1911) pp. 537-49 (3 figs.). 



i Atti R. Accad. Sci. Fis. Napoli, 1910, pp. 1-34 (2 pis.). 



