ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 567 



spinal ganglia of various mammals. The cells were photographed both 

 in the stained and in the unstained condition, and the photographs were 

 found to yield an exact reproduction of the structure of the cells. The 

 cells in the different animals examined, though var} r iug much in detail, 

 all showed the existence of a stroma or intertwisted reticulum, the size 

 of the meshes apparently depending on the shape of the chromatophilous 

 elements. At first sight, photographs of stained and unstained prepara- 

 tions seemed not to differ from one another, but a more careful exami- 

 nation of the former showed the presence of the chromatic substance, 

 as it were, spread on the subjacent stroma. The shape of the chromato- 

 philous elements appears to depend on the way in which the fibrils 

 interlace, and the structure of these fibrils appears to be more complex 

 than has hitherto been supposed. It is probable that during life the 

 chromatic substance is semi-fluid, and it is only in hardened tissues that 

 it coagulates and becomes arranged about the reticular fibrils. 



Grandry's Corpuscles.* — Prof. A. S. Dogiel and K. Willanen find 

 that the relation of the nerves to these bodies is not so simple as has 

 hitherto been supposed. They have studied the corpuscles in the 

 domestic duck, staining with methylen-blue, followed by ammonia and 

 picric acid, or by a modification of Bethe's method. The result is to 

 show that two kinds of medullated fibres end in the corpuscles. Of 

 these the first penetrate between the tactile cells, and after forming a 

 tactile disc, produce very fine fibrillse, which apparently pass into the 

 protoplasm of the cells. The second set of fibres form pericellular 

 reticula on the surface of the cells. There can be no doubt that similar 

 conditions obtain wherever tactile cells occur, as in the skin of the pig's 

 snout, and in the outer root-sheath of tactile hairs. 



Innervation of Lymphatic Glands.f — Dr. W. Tonkoff points out 

 that considerable uncertainty still exists as to the nerve supply of 

 lymphatic glands. He has used Golgi's method for the glands of 

 various mammals, especially the cat, and finds that the blood-vessels 

 are accompanied by nerve-stems, which form networks about the 

 vessels. These nerves are naturally present only in those parts of the 

 glands in which blood-vessels occur, but trabecular nerves also occur, 

 which serve for the innervation of the unstriped muscles of the tra- 

 becule. The nerves which form networks about the vessels send off 

 also fibrils which interpenetrate the substance of the gland itself. 

 Lymphatic glands must therefore be included among organs possessing 

 an abundant nerve -supply. 



Nerve-endings- ! — Dr. A. Sokolow has applied the methylen-blue 

 method to the Vater-Pacinian corpuscles, in order to investigate the 

 question whether, in addition to the medullated nerve-fibre, there is not 

 within the corpuscle another slender nerve-fibre, as Dogiel § has recently 

 described in Herbert's corpuscles. His material was the mesorectum 

 and mesocolon of a kitten, and he experienced no difficulty in demon- 

 strating the existence of the slender fibril, which forms a network with 

 varicose thickenings over the surface of the inner cylinder. This non- 



* Zeitschr. wiss. Zool., lxvii. (1900) pp. 349-60 (1 pi.). 



t Anat. Anzeig., xvi. (1900) pp. 456-9. J Tom. cit., pp. 452-5 (2 figs.).' 



§ Cf. this Journal, 1899, p. 581. 



