78 



Animal Micrology 



2. Remove the head to a slide and in a drop of the oil dissect out the 

 mouth parts. Transfer them to a clean slide, remove the excess of oil 

 and arrange them in their relative positions in sufficient balsam to hold 

 them in place, then set the slide aside in a place free from dust until 

 the balsam hardens enough to keep the parts from shifting. Make any 

 necessary rearrangement. Add more balsam and a cover. 



MEMORANDA 



1. The Cover-Glass May Be Supported by means of small wax feet or 

 bits of broken cover-glass when the tissue is too bulky to allow the 

 cover-glass to fit down closely to the slide. 



2. A General Rule for Dissociating Tissues is to use small pieces of the 

 tissue and not a very great amount of the fluid. 



3. For Minute Dissections clove oil is often a convenient medium. It 

 tends to form very convex drops, clears well, and renders the object 

 brittle; any or all of which properties may be useful in such dissections. 



4. The Fixation of Pieces of Macerated Tissue (e. g., macerated epithe- 

 lium) in 0.5 to 1 per cent, osmic acid for an hour or so, often proves 

 advantageous. 



