192 PRACTICAL HISTOLOGY. 



Longitudinal sections of ganglia, both spinal 

 and sympathetic, may be prepared from specimens 

 that have been hardened either in picric acid and 

 spirit or in 2 per cent, bichromate of ammonia 

 solution for five days, then in weak spirit (half 

 water) for twenty-four hours, and then in strong 

 spirit. The sections are to be stained in logwood, 

 and mounted in dammar. 



The sections of developing bone (p. 108) (instruc- 

 tions for embedding which by the cacao-butter pro- 

 cess, were previously given) may also be now pre- 

 pared. 



