ZOOLOGY AND BOTANY, MIOKOSCOPV, K I'G. 60S 



to osmotic changes, and the rods as precipitates produced by the meeting 

 of sap from the medullary cavity and the sap of the vesicular cell. 



Intracellular Reticulum in Epithelial Cells of Suprarenale of 

 Hedgehog.* — M. Pihit describes Golgi's intracellular reticular apparatus 

 in these cells. It lies beside the nucleus and ^vithin the centrosphere, 

 but it is uncertain whether this is a spatial coincidence of the two 

 structures, or whether the reticular apparatus is an essential part of the 

 sphere. Nor can it be decided at present whether the reticular apparatus 

 of these suprarenal cells is to be identified with the internal network 

 in nerve-cells. 



Reticular Apparatus in Suprarenal Cells of Hedgehog, f — P. 

 Mulon has studied the minute structure of the cortical cells. In the 

 vicinity of the nucleus there is an area of cytoplasm, without a chou- 

 driome, which contains a coagulable substance, assuming diverse aspects 

 according "to the fixative employed. The colorability is also variable. 

 The substance forms a true reticular apparatus, and has no relation to 

 the chondriome. In the case studied it is certainly not due to a bad 

 fixation of the mitochondria. 



Ciliary Ganglion of Reptiles.J — M. von Lenhossek gives an account 

 of the minute structure of the ciliary ganglion in lizards, snakes, and 

 Chelonians. While the general relations of the ganglion are the same 

 throughout, this is not the case with the histological details. There is 

 a growing complication from lizard to snake, from snake to Chelonian, 

 and this is described at leno;th. 



'&■• 



Minute Structure of the Skin of Geckos. § — W. J. Schmidt gives 

 a detailed account of the minute structure of the skin in these Lacer- 

 tilians. It has been inadequately studied. He deals especially with 

 Fhehiima and Tarentola, and describes the surface relief, the chromato- 

 phores, the epidermis, the sensory structures, and the connective-tissue 

 portion. The latter includes cerium, subcutis, embedded elements, and 

 so forth. The included elements are such as xanthophores, guanophores, 

 porphyrophores, melanophores, vesicular cells, and fatty tissue. 



Periodic Changes of Thymus in Chelonia.|l — Paul Aime gives a 

 histological account of the changes which the thymus of Chelonia 

 exhibits in the course of the year. These are closely associated with 

 periodic changes in the parathymic glands. Thus the regeneration of 

 each of the lobes of the thymus is due to buds from the internal and 

 external parathymic gland. The details of this process are given. After 

 the reconstitution of the thymus, the parathymic connexion is lost. 

 The retrogressive changes are also dealt with. They begin with the 

 appearance of myo-epithelioid cells and the degeneration of the thymus 

 reticulum. 



* Arch. Mikr. Anat., Ixxx. (1912) pp. 157-66 (1 pi.). 



t C.R. Soc. Biol. Paris, Ixxiii. (1912) pp. 268-9. 



X Arch. Mikr. Anat., Ixxx. (1912) pp. 89-116 (2 pis. and 4 figs.). 



§ Zeitschr. wiss. Zool., c. (1912) pp. 139-258 (5 pis. and 15 figs.). 



II C.R. Soc. Biol. Paris, ixxii. (1912) pp. 115-16. 



