^JoCnal.^jSriT«^^^ PROGRESS OF MICROSCOPICAL SCIENCE. 49 
idea is that the nerves end in the secreting cells, and his drawings 
tend less or more to confirm his assertion. The illustrations to the 
present two papers (Max Schultze's ArcMv, ibid.) do not bear him out 
as fully as those annexed to his earlier paper. Indeed, we are puzzled 
to believe that the drawings are not generalized, i. e. that they do not 
represent the observations of several specimens rather than one. We 
have worked a good deal at both salivary and pancreatic lobules, and 
with powers higher than Pfliiger's (600 diameters), but we certainly 
never saw anything like the definition of structure he depicts, nor were 
we able, as he appears to be, to distinguish the fine connective tissue 
fibres from the fine nerve fibres. It must be said for Pfliiger that he 
used osmic acid, which is stated to bring out nerve structure in a 
remarkable manner. 
The Histology of the Muscular Tissue of the Invertehrata. — Besides 
the paper we have already mentioned as contained in the last number 
of Schultze's Archiv, is a most valuable and elaborate contribution by 
V. G. Schwalbe, of Amsterdam, on the characters of the muscular 
fibres in most invertebrate animals. He goes through several types, 
beginning with the Actinia, and ending with Echinoderms and 
Gastropods. Two handsome folding plates illustrate the memoir, 
and represent the muscular fibres as prepared with chromic acid, 
bichromate of potash, and osmic acid, and seen with a No. 10 Hart- 
nack's immersion lens. The fibres of some of the annelids (like 
Nereis) are peculiar in possessing a number of lateral processes In 
others the sarcolemma is indicated, though it may of com^se be asked 
in how far it is a post-mortem or artificial structure, or how far it is 
represented by the connective tissue which unites the muscular fibres 
together. The markings on some of the fibres can hardly be taken to 
represent striae. They rather recall the appearance seen on badly 
illuminated specimens of certain diatomaceaB. 
Foreign Microscopes. — Again referring to the last issue of Schultze's 
Archiv, we find an interesting, though sketchy account, by Dr. Leopold 
Dippel, of the different microscopes which may be had abroad, and 
which are sufficiently good for general work, for hospital use, and so 
forth. The prices and the names of makers are in all cases given. 
The Structure of Bryozoa. — The anatomy of Cyphonautes and of 
Memhranipora is given by Herr A. Schneider, in a memoir of nearly 
20 pages. The plates contain several well-drawn figures, illustrating 
the anatomy of C. compressus and M. pilosa. The author deals with 
the mode of classification also. — Schultze's Archiv, 5 Band 2 Heft. 
Beichert and Du Bois Beymond's Archiv. — The last number (May) 
of this contains hardly any histological matters, though it has some 
anatomical papers of considerable interest. 
The Central Nervous System of Birds and Mammals. — It would be 
impossible to abstract the lengthy memoir on this subject, by Dr. 
Stieda, of Dorpat, in Siebold and Kolliker's Zeitschrift [May]. It 
extends over more than 90 pages, and treats of the microscopic relation 
of cells and fibres in both the brain and spinal cord. The plates are 
three in number, and embrace about 60 beautifully drawn figures. 
The Development of Alciope. — Dr. Buchholz, of Greifsvvald, has 
given a short account of the development of the curious annelid^ 
VOL. II. E 
