156 
PROGRESS OF MICROSCOPICAL SCIENCE. 
the author has done on the healthy lung may be gathered from the 
following passage : 
" The radicles of the lymphatic system of the lung are distributed 
over three different parts: (1) the walls of the alveoli; (2) the walls 
of the bronchi ; and (3) the pulmonary pleura. The first system is 
represented by irregular lacunae and anastomosing canals, being the 
spaces for the bronchial connective-tissue corpuscles ; it gives origin 
to lymphatic vessels which are provided with a special endothelial wall. 
.... The second system of radicles, viz. that situated on the wall of 
the bronchi, is represented by irregular lacunae and anastomosing canals 
in the mucosa, on the more external parts both contain, or 
more correctly speaking are lined, by the connective-tissue corpuscles. 
.... The third system of radicles, viz. those on the pulmonary 
pleura, are also interfascicular lacunae, communicating with each other 
by a few canals ; each lacuna is lined by a connective-tissue cell-plate." 
Of course but the merest outline can be gathered from the above 
quotation, therefore we trust our readers will obtain the work itself. 
With regard to the pathological portion, Dr. Klein is here standing 
almost on virgin soil, at least as far as English workers are concerned, 
with the exception of the writings of Dr. W. Fox and Dr. Sanderson. 
The German authorities are, however, copiously referred to, and their 
different views are noted. It is to be observed, however, that Dr. 
Klein does not agree with all their opinions, but in some cases expresses 
his own ideas very distinctly. This is more especially evident in 
regard to Hering's views on the subject of miliary tuberculosis in man. 
The latter is of opinion that the so-called giant-cell "corresponds 
merely to a granular substance filling up the lumen of a lymphatic 
vessel ; and what is generally described as the nuclei of the giant-cell, 
to be identical with the endothelial cells (!) of that vessel." To this 
Dr. Klein replies that " I have occasionally seen a giant-cell of • a 
distinct tubular shape. But this I think may simply mean that the 
giant-cell has, from some reason or other, grown into that shape. 
Besides, the disposition of the giant-cells in many a tubercle of the 
lung is in conflict with their being identified with lymphatics." 
Throughout, the work is excellent in its nature. We note too that 
the author's style is much less German than it was heretofore. Indeed, 
with a few exceptions, the book might have been written by an 
Englishman. And while we are well satisfied with Dr. Klein's labours, 
we must not forget to say a word in praise of his publishers, who 
have issued the volume in a most thoroughly creditable style. 
PEOGKESS OF MICEOSCOPICAL SCIENCE. 
Diatoms in Infusorial Earth being absorbed by Boots of Corn. — In 
a paper published in the ' Quarterly Journal of Science ' for July, 
and written by Dr. W. B. Wahl, on the subject of infusorial earths, the 
author refers to this question, and gives the accompanying Plate CLV. 
(which has been kindly lent us by Mr. Crookes, the editor). Dr. Wahl 
says that the manufacturers, to demonstrate the availability of the 
