77/ A- fKU'ls. 

 MARE. 



COW. 



It will be seen from these measurements that no great practical utility 

 can be derived from pelvimetry, so far as averages are concerned ; as the 

 diameters of the pelvis must vaiy with the size and other peculiarities 

 in an animal's conformation ; so that we may have considerable differ- 

 ences. In the Mare alone, Saint-Cyr found a difference in the supero- 

 inferior diameter of 2V inches, and in the transverse diameter of 2.^ 

 inches. 



With the view of determining the capacity of the pelvis of the living 

 animal at a given time, external pelvimetry has been resorted to. This 

 consists in ascertaining the distance between the angles of the haunch 

 on each side, that between the two ischial tuberosities, and that between 

 the coxo-femoral articulation and the highest part of the croup. To 

 find out the first, a piece of wood is placed vertically against each 

 haunch, and the space between them is measured ; for the second, a 

 tape measures the distance between the ischial tuberosities ; and for 

 the third, a piece of wood is placed horizontally across the summit of 

 the croup, while another is laid in the same direction along the trochanter 

 and the ischial tuberosity, the vertical distance between the two pieces 

 giving the measurement. Taking into consideration the shape of the 

 pelvis, it has been calculated that the transverse diameter of the outlet 

 should be nearly equal to one-fourth of the distance between the 

 haunches, added to that between the ischial tuberosities ; while the 

 supero-inferior diameter of the outlet is supposed to be equal to three- 

 fourths of the vertical distance separating the coxo-femoral articulation 

 from the summit of the croup. These measurements only give the sup- 

 posed diameters of the outlet ; but Arloing, who has devoted much 



