^o8 Silll-horn CbzJdrert.-^Difcovery refpeSing the Blood. 



which afflift mankind. Inoculation, therefore, ought no 

 longer to be performed with the matter of the common fmaU- 

 pox or variolous matter, but with the vaccine ; becaufe in- 

 oculation with the latter is free from all danger, whereas 

 that with matter of the common fniall -pox is attended fome- 

 times with fatal confequences. 



Herholdt has proved that the liquor of the amnios pene- 

 trates fometimes into the tympanum of the foetus ; from 

 which he concludes, that it introduces itfelf fometimes, alfo, 

 into the tracheal artery, and fills it before birth. When the 

 child is brought forth, it is neceffary, therefore, to affift that 

 liquor in flowing off. Nature generally operates in this cafe 

 alone ; but its efforts are fonietimes ineffectual, and the child 

 is fuppofed to be ftill-born. In fuch circumftances it muft 

 be aflifted. This the author did in thirteen children, whom 

 he reftored to life by facilitating the efcape of the liquor. 



Dr. Buvina has made experiments which tend to prove, 

 that in living animals the red blood is retained in its proper 

 Cavities by the aftive vitality of the parts, rather than by the 

 fmallnefs of the veffels and pores. This he proved by making 

 injetlioas of blood. Thefe inje6lions in the living animal 

 penetrate only to the veffels, in which it circulates during 

 life. This he proved in a living calf; but, having deprived 

 the animal of life by cutting the fpinal marrow, the inje6lions 

 immediately penetrated to the moft delicate veffels of the pe- 

 rioftcum and other parts, and gave them a red colour, which 

 they have not in the living animal. He has even feen the 

 blood iffue from wounds, fuch as thofe of veficatories. He 

 thence concludes, that if the blood in the living animal does 

 not penetrate to feveral delicate veffels, fuch as the lympha- 

 tic, it is on account of the refiftance oppofed to it bv the force 

 of vitalitv, and not on account of the fmallnefs of the orifice 

 6f the veffels. The fpontaneous echymofes, which take place in 

 the fcurvy and fome other difeafes, feem to arifc from the 

 weaknefs of the vital forces, which permit the blood to pe- 

 netrate to the capillary veffels. 



The fame author has demonftrated, by dire6t experiments, 

 that a portion of the bone of a body, newly deprived of life, 



may 



