. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PANCREAS. given by the most trustworthy authorities, all conspire to invest the practical investigation of the subject with an amount of difficulty and doubt greater, I think, than that which would beset almost any other path of micro- scopical research. And I may add to this, what would naturally be its accompaniment, a deficiency on the part of the authors that I have consulted, in that very kind of informa- tion that the practical difficulties of original research make one crave in others. The only observations on whi
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. PANCREAS. given by the most trustworthy authorities, all conspire to invest the practical investigation of the subject with an amount of difficulty and doubt greater, I think, than that which would beset almost any other path of micro- scopical research. And I may add to this, what would naturally be its accompaniment, a deficiency on the part of the authors that I have consulted, in that very kind of informa- tion that the practical difficulties of original research make one crave in others. The only observations on which I think reliance is to be placed for the solution of the difficulties that the examination of a structure so in- volved and delicate as the one under consi- deration presents, are observations made with the microscope on the parts, fresh, in situ, unaffected by re-agents, and undisturbed by such manipulation as shall interfere with the normal relations of their minute anatomy; and such observations I cannot find. Miiller's descriptions and drawings on this subject, in his admirable monograph, " De Glandularum Secernentium Structura Penitiori," are either taken from the parts unmagnified, or magnified with such low powers as make them valueless for the solution of the special difficulties of the case. The same observation applies to the accounts of the minute structure of the pan- creas contained in the ordinary works on de- scriptive anatomy, from their being descrip- tions of the minute structure as seen by the naked eye, or as made out by a coarse kind of disintegration, or by mercurial injections. The most satisfactory microscopical ex- aminations of the pancreas may be made, I think, from those of the Rodents ; for in them the gland being spread out in its proper me- sentery in an arborescent or seaweed-like form, it is in some parts so thin as to trans- mit sufficient light for its examination without any compression or dissection whatever ; in- deed, along t
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