6^6 



On motion of Dr. Dean the Section approved the bill and the 

 Secretary was directed to express the entire commendation of it to the 

 Council. 



Dr. Ahnold Gbaf read a paper on "The structure of the Nephridial 

 in Clepsine". He finds in the cells of the intracellular duct fine cyto- 

 plasmic anastamosing threads which form a contractile mechanism. These 

 are stimulated by granules which are most numerous near the lumen of 

 the cell, and thus a peristalsis is set up which moves the urine out of 

 the duct. In the upper part of the intracellular duct, the two or 

 three cells next to the vesicle or funnel have no distinct lumen but are 

 vacuolated; the vacuoles of the first cell being small, those of the second, 

 larger and so on , till the vacuoles become permanent as a lumen. He 

 explains the action of the first cell as being similar to the ingestion of 

 particles by the infusorians. The matter taken up thus from the funnel 

 by the first cell is carried by the rest and so on, till the cells having 

 a lumen are reached. The presence of the excretum causes the granules 

 to stimulate the muscular fibres of the cells, peristalsis results and the 

 substance is carried outwards. The character of this contractile reticulum 

 ofi^ers an explanation of the structure of a cilium as being the continu- 

 ation of a contractile reticular thread. 



N. K. Haeeington in "Observations on the lime gland of the 

 Earthworm" described the minute structure of these glands in L. terrestris, 

 and showed that the lime is taken up from the blood by wandering 

 counective tissue cells which form club-shaped projections on the 

 lamellae of the gland , and which pass off when filled with lime. The 

 new cell comes up from the base of the older cell and repeats the 

 process. This explanation is in harmony with the fact that in all other 

 invertebrates lime is laid down by connective tissue cells. Histological 

 structure and the developmental history confirm it. 



Dr. Bashfoed Dean offered some observations on "Instinct in some 

 of the lower Vertebrates". The young of Amia calva, the dogfish of the 

 Western States, attach themselves, when newly hat ched to the water 

 plants at the bottom of the nest which the male Amia has built. They 

 remain thus attached until the yolk sac is absorbed. As soon as they 

 are fitted to get food they flock together in a dense cluster following the 

 male. When hatched in an aquarium they go through the same processes. 

 The young fry take food particles only when the particles are in motion, 

 never when they are still. The larvae of Necturus also take food 

 particles that are in motion. C. L. Beistol, Secretary. 



Anatomisclie Gesellscliaft. 



Für die Berliner Versammlung haben ferner angemeldet: 



15) Herr Chievitz: Einige Bemerkungen über Situs partium beim aus- 

 getragenen menschlichen Fötus, mit Demonstration von Abgüssen. 



16) Herr Meves: Demonstration von Präparaten, betr. Attractions- 

 sphären und Zellteilung im Salamanderhoden. 



Dr. Fe. Meves, Assistent am anatomischen Institute der Uni- 

 versität Kiel, ist in die Gesellschaft eingetreten. 



Krommaausche UucUdruckerei (liermaQU l'uble^ m Jeua. 



