DESCRIPTION OF PLATE. 



A photograph of a section through the teat and one quarter of the 

 udder of a cow. The parts represented by the letters A. B. C, 

 indicate the three arbitrary divisions i?ito which the gland was divided 

 for purposes of examination. 



We are indebted to Dr. G. S. Hopkins for the loan of the excelleyit 

 museum speci7nen from which the photograph was taken. 



