Textbooks of microtechnique contain recipes for various adhesives: chrome alum-gelatin, Mayer's albumen and starch paste are traditional. More recent methods include giving the glass surface a positive charge by coating with polylysine or reaction with 3-aminopropyltriethoxysilane (APES or TES) to make "silanized" slides. See also the FAQ item on how to prepare silanized slides. There is also an FAQ item about polylysine. Here are some hints from individuals. No. 3 is pertinent to the use of any adhesive or none at all.