CHAP. I. 
RAPHIDES. 
35 
but are exclusively placed in the intercellular passages. The 
slender kind (fig. 14.) he states to be crystals of phosphate of 
lime, from -^^ to of a millimetre in length, and to be in 
reality six-sided prisms, terminated at each end by a pyramid 
with the same base. The crystals found in the Cactus and 
Rhubarb (fig. 12. and 13.), he says, are composed of oxalate 
of lime ; and he represents them to be right-angled prisms, 
terminating in a four-sided pyramid. (Nouv, Si/sL de ch. org, 
p. 522.) Mohl differs from this statement. He says that ra- 
phides are never six-sided prisms, as Raspail asserts ; but that 
they are right-angled four-sided prisms, which gradually vanish 
into points. And he declares that Meyen is right in asserting 
that the raphides are constantly formed inside the bladders, 
and never in the interstitial passages of cellular tissue. (Anat 
Palm. p. 28.) 
