EEYIEWS. 



The Anatomy of the Lymphatic System. By E. Klein, 

 M.D., Assistant Professor at the Laboratory of the Brown 

 Institution, London. II. — The Lung. London : Smith, 

 Elder, & Co., 1875. 



In this handsome volume Dr. Klein gives a full account 

 of his researches into the minute anatomy of the lymphatics 

 of the lung and pleura, a short summary of which had 

 already been communicated by him to the Boyal Society.^ 



The Avork is divided into two sections, the normal con- 

 ditions being described very fully in the first, while the second 

 is occupied by a most interesting account of the pathological 

 changes in acute and chronic inflammation, in the artificial 

 tuberculosis of guinea-pigs, and in the acute miliary tuber- 

 culosis of man. 



Commencing in the first section with the pleura. Dr. Klein 

 points out a remarkable difference in the appearance of its 

 endothelium in the distended and collapsed lung. In the 

 former, in which it has to cover a wdder area, the endothelium 

 is seen as flattened plates, rather thicker in the centre, with 

 a flattened circular nucleus, and only faintly granular body ; 

 whereas in the collapsed lung the cells are distinctly granular, 

 and are moreover no longer flattened, but shortly columnar, 

 with a spherical nucleus. The tops of the cells are seen to 

 be rounded, leaving a considerable space between neighbour- 

 ino- cells, the deeper portions only of which are cemented 

 toc^ether. The endothelium of the costal pleura consists of 

 flattened plates, so that it difl"ers from that of the pulmonary 

 pleura in the same manner as Waldeyer has shown that of 

 the surrounding part of the peritoneum to differ from that 

 of the upper part of the ovary, the cells in each case 

 bearing a close resemblance to an epithelium. Passing on to 

 the matrix of the pleura, Dr. Klein describes it as consisting 

 of extremely delicate connective tissue with a fcAV elastic 

 ' 'Proc. Roy. Soc.,' January, 1874, 



