230 BOVINE OBSTETRICS 



lower one can be pushed to aud fro. Two jaws, the lower one 

 of which is movable, and which can be closed by pushing the 

 rod ahead, are found on the one end. The noose is now 

 placed between the jaws of the instrument and introduced. It 

 proved itself useless in practice. Already in 1793 Eberhard 



Fig. 31.— Gunther's Porte-cord. 



had made for the same purpose a turning stick (Kehrstock). 

 This instrument consists of a whale-bone with a knob of ivory 

 on the one end ; a vertical groove in the knob receives the rope 

 or web. 



Binz's obstetrical probe (fig. 32) is a flat, curved stick, 45 

 cm. in length, with an eye in the curved end. It is mainly 

 used to cord the head when deviating backward, or the legs 



Fig. 32.— Obstetrical Sound. 



.when incompletely extended. The rope or noose is run 

 through the eye, and carried behind and around the retained 

 part, until the loop can be grasped with the hand and the in- 

 strument retracted. 



Gunther's long hook (fig. 33) is used in the same way as 

 the porte-cord. 



Fig. 33.— Gunther's Curved Porte-cord. 



Darreau's porte-cord (figs. '■'> 1 and 34a) is 80 to 85 cm. long, 

 the rod having a diameter of 6 to 7 mm. 



Binz, Schaack, Ilueff constructed porte-cords to secure the 

 head, which can be dispensed with in practice. 



