280 SUMMARY OF CUKKENT KK8EAK(JHHS RELATING TO 



ill the skin, cartilage, muscles, nervous system, gut, liver, pronephros, 

 and gonads. The changes are associated with regulative processes. 

 They are necrobiotic rather than simply necrotic. 



b. Histology. 



Problem of Mitosis.*— C. F. W. Meek gives a critical account of 

 the various interpretations that have been given of the observed pheno- 

 mena of mitosis. One generalization only appears to have been estal)- 

 lished, that the mitotic spindle is not a figure formed entirely by the 

 action of forces at its poles. This is the basis for further construction 

 after more data have been accumulated. " There is, however, one 

 conclusion that must be drawn from the proposition that we have estab- 

 lished, viz. that the spindle figure cannot now be regarded as an index 

 of the actions at the poles ; at present we have no means of determining 

 how far these actions, if existino-, are limited or counteracted bv the 

 other forces whose presence we have been compelled to admit : and, 

 until this is known, no theory depending entirely for proof upon the 

 conformation of the spindle figure can be regarded as other than 

 hypothetical." 



Salivary Corpuscies.t — Ed. Retterer and Aug. Lelievre discuss 

 the nature and origin of the mucous globules or salivary corpuscles. 

 The fresh saliva contains {a) free cells and {b) the debris of mucous 

 cells, whose swollen hyaloplasm is transformed into fluid masses (mucus), 

 while the reticulum is fragmented into' granulations. Thanks to the 

 fluidifying of the peripheral portion of the mucous cells and the break- 

 ing down of the reticulum, the nuclei and the perinuclear portions of 

 the cytoplasm are set free in the form of polynuclear leucocytes and of 

 lymphocytes, and these constitute the salivary corpuscles. There is no 

 real amceboid movement. 



Chrondriome of Pancreas Cells. J — X. Mislawsky finds that, although 

 the chondriosomes may play an important role in secretion, there is no 

 real proof of the origin of the glandular-gran ula by the granular dis- 

 ruption of the chondriokonts. His observations on the chrondriome of 

 the pancreas cells of the rabbit make this unlikely. It seems that the 

 chondriosomes are vegetative organellEe, subserving the intermediary 

 metabolism. As regards structural arrangements, it appears that the 

 chrondriosomes are disposed interstitially to the plasma-structures 

 proper. 



Minute Structure of Horse's Hoof.§ — M. Lungwitz and H. Erie 

 have made a cai'eful study of the minute structure of the " cartilagines 

 ungulge " of the horse. The general conclusion that they come to is, 

 that the hoof-cartilage is always fibrous and not hyaline cartilage. 



* Quart. Jouru. Micr. 3ci., Iviii. (1913) pp. 567-92. 

 t C.R. Soc. Biol. Paris, Ixxiv. (1913) pp. 6G7-70. 

 X Arch. Mikr. Anat., Ixxxi. (1913) pp. 394-429 (1 pi.). 

 § Auat. Auzeig., xliii. (1913) pp. 313-26 (8 figs.). 



