298 NOTES AND MEMORANDA. 



cat's blood be treated with acetic acid after the colouring 

 matter has been dissolved, the shining nucleoli may be still 

 recognised. 



On the Structure of the Human Peritoneum Diaphragmaticum. 

 By Professor G. Bizzozero,in Turin. ^ Bizzozero having found a 

 delicate raembrana limitans underneath the endothelium of 

 the human serous membrane, examined specially that mem- 

 brane in the human peritoneum -covering the diaphragm. The 

 limitans of this latter can be easily isolated in fresh specimens 

 as well as in those that had been treated with Miiller's fluid. 

 Bizzozero finds that the limitans in question, while at some 

 places a continuous uninterrupted membrane, possesses at 

 others numerous round or oval holes, which appear either 

 irregularly scattered or grouped into larger or smaller groups. 

 These latter consist of ten, thirty to sixty holes, measuring 

 from 4, 10, to 16 mm. " This arrangement of the limitans 

 stands in an important relation to the distribution of the 

 lymphatics of the peritoneum diaphragmaticum. The lumen 

 of the superficial lymphatics is not everywhere separated 

 from the peritoneal cavity by an uninterrupted connective- 

 tissue membrane, but on larger portions only by a connective- 

 tissue meshwork. Over this the limitans is expanded in such 

 a manner that its holes coincide with the holes of that mesh- 

 work. In this manner, if we exclude the surface endothelium, 

 an open communication is established between the lymphatic 

 vessels and the peritoneal cavity." i This relation is best 

 developed on a part of the peritoneum which covers the mus- 

 cles immediately around the central tendon. "The network 

 of lymphatic vessels is here not so dense as on the central 

 tendon, but the individual vessels are much broader, so that 

 the membrane (especially in young individuals) appears 

 cribrous already on the naked-eye inspection. 



Publication of a series of Diatoms and of other Algse. 

 By Professor P. T. Cleve, of Upsala, Sweden, assisted by Mr. 

 J. D. Moller, of Wedel, has the intention of publishing a 

 series of mounted diatoms, marine and freshwater forms. 

 The first part contains forty-eight slides, and its price is 40 

 shillings (40 Reichsmark, 50 francs), expenses of freight not 

 included. Orders are executed from the middle of August 

 this year, and may be sent to Professor Cleve. Many of our 

 readers will also be glad to learn that Dr. Oeit B. Wittroch, 



1 Vienna Medic. Jahrbucher I., 1877. 

 ^ A further communication on tliis subject by Bizzonzer and Salvioli 

 (' Studi sulla struttura a sui linCatici delle sierose umane.' Parte prima.) 

 will be reported upon iu our next number. 



