1899] MICROSCOPICAL JOURNAL. 1% 



are any bare spots, breathe on the slide again and repeat 

 the operation. Run a ring of cement round the top of 

 the cell. Place a cover on and finish as before directed. 

 Selected specimens may be mounted in the same way, by 

 picking up the single object with a hog's bristle fastened 

 to an ordinary light handle, such as is used for inserting 

 into the camel hair pencils. 



There are not likely to be any failures in the above as 

 the process is so simple. The only thing that may hap- 

 pen is the varnish running under the cover glass. 



Mounting Rock Sections, Teeth, Bone, etc. — Take 

 a rock section on its glass, place it in a saucer in clean ben- 

 zole for twenty-four hours or until it leaves the glass of 

 its own accord. Now take it up on a spatula. A square 

 ended one is best as when the section is on it, all excess of 

 benzole is easily got rid of by standing it square end 

 downwards and gently tapping the end, if needs be, on a 

 glass slip. Don't use forceps to get the section onto the 

 spatula, but your brush. Place the spatula just under the 

 section and draw it on while in the benzole. Wash again 

 in clean benzole, and have your 3X1 in. slip ready, with 

 some balsam and benzole on it. Place your section in po- 

 sition (having first got rid of all excess of tluid). Add 

 more of the media until it is well covered. Place it 

 aside to dry. Rocks are best mounted by the exposure 

 method before described. An oval-shaped cover is a 

 great improvement, but of course any shape cover may 

 be used, provided it is of suitable size. To mount teeth 

 sections, a little different treatment is required. First, 

 soak them off the glass (they are ground on in benzole), 

 then wash in clean benzole, and put aside to dry. Make a 

 rather thin solution of gum arabic, adding two drops of 

 carbolic acid to about one oz. When the teeth are quite 

 dry, take a section in the forceps, dip it in the gum solu- 

 tion. Having your slip ready cleaned, place it in the cen- 

 tre, press down, and set aside to dry. The object of the 



