44 DR. KLEIN, 



In the same contribution (p. 447) Reniak describes clear 

 vesicles of a spherical or oval shape, which occur on the 

 mesogastrium of frogs of all ages and sizes. They are in 

 most cases elevated above the surface, are of various sizes, 

 from V^jth to -^th of aline. Surrounded by concentric layers of 

 knotted (embryonal) fibre-cells, the vesicles contain various 

 bodies of a parasitic nature, which are in rotation. The 

 internal surface of the vesicles is lined by cilia. E-emak 

 could not ascertain how these ciliated vesicles are formed : 

 the smallest of them also contain no foreign body whatever in 

 their interior. Remak, indeed, could not certainly persuade 

 himself whether they were covered with cilia. Reinak further 

 considered it j robable that there is a proliferation of the 

 ciliated vesicles by segmentation. From the circumstance 

 that the con ten; ■ of many vesicles move in very various planes, 

 Remak concluii s that there are delicate partitions in the 

 interior of the ciliated vesicles. The formation of these 

 ])artitions seems to Remak to pass possibly for the commence- 

 ment of the segmentation. 



Remak considers these ciliated vesicles as well as the 

 coverings of the corneous filaments, as cysts which contain 

 ])arasitic bodies, and stand in a special relation to the develop- 

 ment of the same. 



Female frogs sometimes suffer from chronic peritonitis in 

 the winter season, and that sometimes severe in intensity, 

 sometimes less so. The changes which take place here 

 will not be minutely discussed in this place. This con- 

 stitutes a part of the investigation undertaken by Professor 

 Burdon Sanderson and myself on the chronic inflammation 

 of serous membranes in general, a report of which will very 

 shortly be published. About the corneous filaments and 

 ciliated vesicles described by Remak, I shall permit myself to 

 make a few remarks only, and these adapted to make the 

 statements of Remak complete. 



If we open the abdominal cavity of a female esculenta which 

 has been previously decapitated, we find, in some cases, on the 

 mesogastrium (which, after the fashion of the omentum of 

 many mammals, is fenestrated), or on the peritoneal covering 

 of the stomach, on the mesentery of the intestine, and partly 

 on the peritoneal coat of the intestine as well, certain 

 structures which, to the naked eye, bear a resemblance to black 

 hairs, and which look as if they were simply lying upon the 

 parts just mentioned. However, as Ave may easily convince 

 ourselves by using a forceps, they may be removed by pulling 

 forcibly. If we bathe tlie structures referred to in a solution 

 of gold or of silver, Ave jjerceive, even with the unassisted eye. 



