1894.] MICROSCOPICAL JOURNAL. 53 



The piece that was sent me for examination was the 

 merest bit, so small that if it had been Barbadoes earth 

 one would not have taken the trouble to clean it, and yet 

 it yielded a good many forms and a number that were 

 strange to me, which may serve to show how rich the 

 material is. Of course, under the circumstances, I was 

 not disposed to waste any of it by excessive washing and 

 there was considerable foreign material mixed with the 

 final settling and the forms were not as clean as they 

 would otherwise have been, but I am convinced that th«^ 

 process given above will yield good results, tjiough it 

 may need to be supplemented in order to render some of 

 the bulkier forms perfectly transparent. Sometimes, in- 

 deed, it seems almost impossible to get all the forms free 

 from the foreign material lodged in the skeletons. For 

 example, there is some material which was sent me from 

 Barbadoes by Prof. Gr. Frith Franks, a rolled pebble from 

 the shore near Jois River, which I have boiled and boiled 

 in the strongest acids without being able to remove all 

 of the dark red foreign material from the shells. But 

 those forms are sufficiently clean for study. 



I may add that it will be well to break up the Mani- 

 toba material into small and thin pieces before subject- 

 ing to treatment. 



On the Development of the Continental Form of Microscope 



Stand. 



By J. B. NIAS, M. D. 

 LONDON. 



Conchided from January^ page 27. 



In Fig. 4 is represented the stand as patented by Tre- 

 court and Oberhaeuser, after a cut in Dujardin's article 

 and the drawings of the patent; specimens of the man- 

 ufacture, however, which I have seen correspond more 

 closely to the design of Fig. 2, Certain features whicji- ; / ^^^-w. 



in* "^••' 'Af- 



