1895.] MICROSCOPICAL JOURNAL. 203 



elements by macerating a fragment of the small intes- 

 tine in the i alcohol. Brush off the lining epithelium, 

 then strongly scrape the same surface by the scalpel. 

 Spread the result in a drop of the i alcohol, stain in 

 picro-carmine, mount in glycerine. 



To be continued. 



Morphodiscs, Coccoliths, and Discoliths. 



By ARTHUR M. EDWARDS, M. D., 



NEWARK, N. J. 



When I noticed the Discoliths in the clay beds of 

 Woodbridge, N. J., in the American Journal of Science, 

 June, 1883, I found they were not known to microscop- 

 ists generally, although they were to geologists who 

 use the microscope. They were pretty well known, especi- 

 ally as Huxley's paper on them, in the appendix to Capt. 

 Dayman's Report of Soundings taken in H. M. S. 

 " Cyclops," 1858, made them farther known. The 

 microscopical fauna of the Cretaceous in Minnesota, 

 with additions from Nebraska and Illinois, by A. Wood- 

 ward and B. W. Thomas, in Vol. Ill of the Final Report 

 of the Geological and Natural History Survey of Minne- 

 sota, 1893; and Dallinger's Carpenter on the Microscope, 

 Vllth Ed., 1891, makes them pretty well known, but E. 

 H. Schwartz's paper on Coccoliths, in the Annals and 

 Magazine of Natural History for 1894, for which I am 

 indebted to him, makes them clear and distinct, so may 

 serve as a text to what I have to write about them. 



Their bibliography is rather extensive, especially when 

 we consider that they have been known only a few 

 years. But they are small and require nice manipula- 

 tion to bring them out, and, besides, it is doubtful ex- 

 actly what they are, although evidently organic and 

 present now as in the chalk of the cretaceous. They 



