336 



DH, E. KLEIN. 



areae loosened and detached, but the elements of the tissue: 

 such as unstriped simple fibres, connective-tissue cells, nerve- 

 fibres and capillary blood-vessels, remained undisturbed, 

 presenting all details of structure. Thp same details may be 

 of course also seen where the endothelium of the surface has 

 retained its position, only for obvious reasons it requires a 

 more attentive examination. 



(-y) The ground-plate is faintly stained and therefore not 

 •well defined in all parts of its outline. Although the 

 greater number of processes of the jihrillar suhstance — 

 except the thicker branches — ])ass beyond the limits of the 

 ground-plate, still there are some minute processes which 

 remain within its area. I find a good many instances in 

 which 1 can trace fibrils coming out of the nucleus and 

 running up to the margin of the ground-plate, where they 

 terminate. These fil)rils, which appear to connect the nucleus 

 directly to the edge of the ground-plate, are not represented 

 specially in fig. 23, but they are very clear in many con- 

 nective-tissue corpuscles. An inspection of fig. 23 no doubt 

 suggests to the reader — as a cursory inspection of the 

 specimens would to the observer — that, supposing the ground- 

 plate be not visible, the rest of the connective-tissue cor- 

 puscle corresponds to those typical branched connective- 

 tissue cells as they usually present themselves, viz. an oval 

 nucleus unequally surrounded by the 'granular' cell- 

 substance, which is drawn out into more or less branched 

 processes. 



I shall have occasion to return to this question of the 

 nature of connective-tissue corpuscles in the second part of 

 this memoir, when 1 shall be able to discuss it in connection 

 with tlie cells of tendon, couu^a aiul loose connective tissue, 

 and when I shall be aUle to examine critically the assertions 

 and observations of various writers, especially v. Heckling- 

 hausen, Strieker, Rollctt, Schwcigger-Seidel, Schivalbe, Boll, 

 Waldeyer, Rativier, Griinhageti, Eberth, Ewetsky, Bottcher, 

 Bizzozero, Waller, Lavdovski, Axel Key, Retzius, Spina, 

 Renaut, but this much I may say here that the two sub- 

 stances, viz, groimd-plate and fibrillar substance connected 

 with the intranuclear network of the oval nucleus form the 

 essential parts of a connective-tissue cell. It is to me clear 

 that in the case of the connective-tissue cells of the mesentery 

 the two parts are not merely sujierimposed, but form one 

 integral element in the same manner as I stated it to be 

 tbp case with the endothelial cells of the surface. 



V. The blood-vessels and lymp/ia/ics. 



In all blood vessels of our specimens we recognise t/te net- 



