TACTILE HAIRS. 29 1 ? 



an hour into the formic-acid and gold-chloride mixture, the 

 gold is reduced in slightly acidulated water, hardening is 

 completed in alcohol, and longitudinal and transverse sections 

 are made. For DRASCH'S method see Zeit. f. wiss. Mik., iv, 4, 

 1887, p. 492. 



