LECTURE III. 



FEBRUARY 20, 1858. 

 PHYSIOLOGICAL AND PATHOLOGICAL TISSUES; 



The higher animal tissues : muscles, nerves, vessels, blood. 



Muscles Striped and smooth Atrophy of The contractile substance and con* 

 tractility in general Cutis anserina and arrectores pili. 



Vessels Capillaries Contractile vessels Nerves. 

 Pathological tissues (Neoplasms), and their classification Import of vascularity 



Doctrine of specific elements Physiological types (reproduction) Heterology 



(heterotopy), heterochrony (heterometry), and malignity Hypertrophy and 



hyperplasy Degeneration Criteria for prognosis. 

 Law of continuity Histological substitution and equivalents Physiological and 



pathological substitution. 



IN my last lecture I portrayed to you the first two 

 groups of tissues, the one embracing epithelium or epi- 

 dermis, and the other the different kinds of connective 

 tissue. What still remains forms a somewhat heteroge- 

 neous group, the individual members of which do not, 4 

 indeed, in the degree that is the case with epithelium 

 and connective tissue, bear a real relationship to one 

 another, yet, on the whole, present a certain correspon- 

 dence, in that they constitute the higher animal struc- 

 tures, and are distinguished by their specific mode of 

 development from the less highly organized epithelial 

 and connective tissues. Moreover, most of them appear 

 under the form of connected, more or less tubular, struc- 

 tures. If a comparison be instituted between muscles, 

 nerves, and vessels, the idea very readily suggests itself 



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