The Dental cosmos . ons in the walls of the vessels,as in degenerations. Osier10 has ob-served that in thrombus formation theblood platelets, fully investigated by Biz- that the filaments of fibrin spread prin-cipally from these plate masses. Theyundergo viscous metamorphosis and alsoconglutination as explained by Thoma13. The thrombi formed in the sectionswhich form the subject of this paper areobviously neither entirely the red northe white7 varieties, but are clearly forthe most part of a hyaline character, HOPEWELL-SMITH.—VASCULAR LESIONS OF THE DENTAL PULP. 139 consisting of cells, platel
The Dental cosmos . ons in the walls of the vessels,as in degenerations. Osier10 has ob-served that in thrombus formation theblood platelets, fully investigated by Biz- that the filaments of fibrin spread prin-cipally from these plate masses. Theyundergo viscous metamorphosis and alsoconglutination as explained by Thoma13. The thrombi formed in the sectionswhich form the subject of this paper areobviously neither entirely the red northe white7 varieties, but are clearly forthe most part of a hyaline character, HOPEWELL-SMITH.—VASCULAR LESIONS OF THE DENTAL PULP. 139 consisting of cells, platelets, fibrin fila-ments, and a colorless, semi-transparent,homogeneous material. They are en-tirely non-infected, although hyalinethrombi are generally associated with in-fected conditions. atrophy, through loss of atrophic in-fluences. The chemical changes arethose undergone by the blood throughsystemic derangements such as anemia,chlorosis, and those which take placetoward the end of exhaustive diseases. Fig. Reticular atrophy of pulp with thrombosed capillaries. (Magnified300 diameters.) H. Small hemorrhage near thin-walled vessel. Thus it would seem that, in the dentalpulp, chemical changes in the blood, plusthe unusual arrangement of the terminalvessels, assisted by the vis a tergo whichnaturally leads to a certain amount ofretardation of the flow and thereforecoagulation—as first pointed out byVirchow—are the originators of the The suggestion of iniVvtivity can beat once dismissed, as all the sectionswhich have come under the writersnotice have been obtained from teeth, ofthe young and old alike, whose macro-scopical aspects appeared to be sound. It is of course well known that theblood of chlorotic patients may especially 140 THE DENTAL COSMOS. tend to produce diseases of the vesselwalls—due, no doubt, to the great dimi-nution of red corpuscles and the rela-tively greater number of leucocytes, andtheir slow movement along the walls of accompanied by the forma
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