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> Neil Clark asked:
> Does anyone know whether there is a
> >simple way of determining how many pores reach the outer
> >it is damaged?
> Yes, you make what is called a tangential section. See the article
> preparation of eggshell for study by Betty Quinn in the Pat Leiggi
> Peter May "Vertebrate Preparation" book by Cambridge University
Yes, but if you do a tangential slice, you still have the problem of not
knowing how many of the pores actually reach the surface of the egg.
Many of the pores do not reach the surface as they terminate
beneath the outer layer. In tangential section I have counted over
2,000 pores per sq cm. I am presuming that the outer layer is sawn
off during tangential section preparation, but also if the surface is
worn then the results would also be spurious. I think that for
physiological studies you would need to use the number of pores
reaching the outer surface?
Curator of Palaeontology
University of Glasgow
Mountains are found in erogenous zones.
(Geological Howlers - ed. WDI Rolfe)