eure Now Ro | PROGRESS OF MICROSCOPICAL SCIENCE. 287 
interesting to observe that even the author and Stilling, though 
holding in common the composite character of the axis cylinder, 
differ from each other as to its arrangement, for while Schultze 
regards this as being composed of fibres simply, Stilling looks 
on it as partly consisting of fibres, but as arranged in a peculiar 
fashion. 
In regard to the division of nerves, the most remarkable 
instances occur among the lower animals, and some of these are 
here recorded by the author. The nerve-hairs of young fish and 
naked amphibia are also referred to by him, but we should think 
much too briefly, for this is a subject of very considerable interest 
to the comparative anatomist. As regards the termination of the 
nerves much information is given. Especially valuable will, we 
think, be found the admirable illustrations of the arrangement 
of the nerves in the electric organs of certain fish of the genus 
Mormyrus. The same may be said of the section upon the mode 
of origin of the nerve-fibres in the nerve-centres. This is a 
subject upon which, much as has been written, very little is known 
for certain. It is illustrated by some very remarkable and inter- 
esting woodcuts, some of which, as those of multipolar ganglia 
(taken from Deiters), are most remarkably suggestive. All 
through, this chapter contains much that is interesting and novel, 
and it will be read with advantage by those concerned in nervous 
research. 
We had hoped to have been able to give some of the details 
upon the Lymphatic system, but we fear that we have already 
exceeded our normal space. All we say in conclusion is, that the 
treatise is a most valuable one; that Mr. Power has performed a 
tedious and extremely difficult task not only with excessive ability 
but with great taste, and we hope that his ideas with regard to the 
appearance of the next volume may fail in nothing. The book 
should be in the hands of every student of Histology. 
PROGRESS OF MICROSCOPICAL SCIENCE. 
On the Taxonomic Value of the Sheath of the Cisophagus, especially 
as regards Sauropsida.—This paper, in the last number of the ‘ Pro- 
ceedings of the Zoological Society, is an addition to the many proofs 
that Professor Gulliver has given of the use of the microscope in 
systematic zoology and botany. Referring to the results of his re- 
searches, published in the same ‘Proceedings,’ June 14, 1842, and 
April 22, 1869, he shows that a sheath of transversely-striped muscular 
fibre exists to a greater or less extent on the cesophagus of Mammalia 
and Fishes, while there is no sheath of such fibre on the cesophagus of 
either Birds or Reptiles. In Mammalia the sheath of striped muscular 
fibre extends cither down to and even on the cardiac end of the 
stomach, or stops short at a more or less distance from the cardia ; 
VOL. EV. : D4 
