CELLOIDIN 111 



204. Johnstone-Lavis and Vosmaer's Balsam Method (Journ. Roy. 

 Mic. Soc, 1887, p. 200). Alcohol material is carefully and gradually 

 saturated, first with benzol, and then with thin and thick solutions of 

 benzol-balsam. It is then dried for a daj' in the air and for several 

 days more in a hot-air bath. When hard it is ground in the usual way. 



205. Weil's Canada Balsam Method, see Zeit. wiss. Mik., v, 1888, 

 p. 200. 



206. Giesbrecht's Shellac Method. For hard parts only, spines 

 of Echinus, shell, etc., see Morph. Jahrb., vi, 1880, p. 95, or the abstract 

 in Lee und IVLvyer, GrundzUge. 



