The Microscope. 237 



of a fiber, bifurcated at its full size. Fig. 27. A very -wide branched 

 end. 



Figs. 28 to 30. — Ends of fibers from the tongue of the house 

 mouse, with the relative arrangement seen in the specimen. Such 

 groups of ends found at the end of a bundle of fibers, apparently 

 enter the corium of the mucosa. 



Fig. 31. — Part of a fiber from the tongue of a house mouse, 

 having groups of nuclei, n, near the end, t, and on the body of the 

 fiber, b. 



Fig. 32. A natural group of tendinous ends from the vastus 

 externus of a house mouse. The form and size of the branches vary ; 

 some of them, as shown in the figures, are broken off. The branches 

 are given off from y^^ to yV ^^- f I'om the tips of the fibers. On W, the 

 part marked t, which approaches nearest to the end of A'', is so small 

 as to resemble an intramuscular end. 



Fig. 33. The branched end of a fiber from the skin of the ear 

 of a house mouse. This end is as great in diameter as the majority 

 of the fibers in the ear. 



Fig. 34. A fiber about 4.5 mm. long, from a penniform muscle 

 of the antebrachium of a house mouse. It is cleft about one-third 

 its length and the tendinous end of each portion, t, is branched. 



ON THE PREPARATION OF TYPE-PLATES, AND 

 ARRANGED GROUPS OF DIATOMS. 



K. M. CUNNINGHAM. 



TN the November, 1887, issue of The Microscope there appeared an 

 -*- article on collecting and cleaning diatoms, being a statement of 

 the results of my own experiences in that line, and near its conclu- 

 sion I expressed the hope that 1 might be able at some future time 

 to contribute an article on the methods employed in selecting and 

 arranging the diatomaceae. Since the article was written, I have been 

 particularly fortunate to have personally met, while in Europe last 

 summer, a large number of prominent diatomists, and, in most cases, 

 have been shown the methods of work peculiar to themselves. 

 Among these noted preparers I may mention J. Kinker, of Amster- 

 dam ; Mr. Firth, and Joseph Wright, of Belfast; Carl Gunter, 

 Rudolph Getschmann and Dr. Otto N. Witt, of Berlin; Edward 

 Thum, of Leipzig; Eugen Weisflog, of Dresden; I. C. Rinnbock, 

 of Vienna; Eugene Burgone, Paris; Harold Dalton, Dr. Henry 

 Stolterfoth, Chester, Eng. ; Mr. Murray, in charge of the department 



