RESEARCH SEMINAR. 317 



tween the specific coagulins and substances derived by artifi- 

 cial immunization. 



August j. The Retinal Nerve-endings in the Eye of Pecten. 

 By IDA H. HYDE. 



Although the more important methods of staining were tested, 

 none proved so satisfactory as the methylin blue method of 

 Bethe, which was used in a somewhat modified form. 



The chief facts regarding the nerve -structure of the eye are as 

 follows : There are two kinds of nerve-tissue. The first is an 

 efferent, or, possibly, a trophic nerve-system, the fibers of which 

 form the side-branch of the optic nerve, and are continuous 

 throughout the peculiar twine-cells to their terminations on the 

 supporting as well as on the nerve-cells in the eye. These fibers 

 penetrate the eye on one side and form a single layer of large 

 unique structures called by the author "twine-cells," as they 

 have the appearance of fibers much coiled in the form of balls of 

 twine. This layer of twine-cells lies between the lens and the 

 retinal disc and on the disc. From these cells fibers extend to 

 other twine-cells, to the tapetum and argentia, as well as to the 

 supporting cells of the retina and as far as the rods. 



The fibers are very fine, have a beaded appearance, and are hi 

 every respect different from the sensory nerve-fibers, which form 

 the second kind of nerve-tissue. 



These sensory nerve-fibers arise as modified nerve-cells, and 

 form the rods which connect with long bipolar cells by means of 

 small dendritic processes. The bipolar cells join the large mar- 

 ginal ganglia by means of nerve-endings in the ganglion. The 

 marginal ganglia form a border of large ganglia cells around the 

 retinal disc, the axones of the ganglia passing in the form of a 

 cup-shaped case over the eye to form the optic nerve. The 

 sensory nerve fibers and cells are surrounded by a hyaline sheath, 

 which is absent in the efferent fibers. 



August j. The Static Function in Gonionemus. By Louis 



M-u REACH. 



The movements of the medusa Gonionemus would indicate that 

 it has a definite sense of equilibrium, and some preliminary exper- 

 im jnts confirmed this view. To localize this sense experiments 



