334 MR. W. WOODLAND ON THE { Apr. 21; 
the competency of this alleged cause, contemplation of the actual 
locomotion of a horse or dog, or reference to the works of Marey, 
Pettigrew, and others will soon dispel it. Further, I have 
shown that the degree of transposition of the testes corresponds 
Text-fig. 57. 
CLUPEA 
SCYLLIUM 
TRITON 
LACERTACCLUMBA 
Diagram illustrating Testis Descent. 
This diagram, based on a series of measurements, illustrates the positions 
and lengths of the testes relatively to the length of the trunk proper (minus tail) in 
Clupea, Scyllium, Triton, Rana, Lacerta (muralis), Columba, the common mouse, 
and the cat, all measurements being reduced to one scale. The vertical sides of 
the rectangle represent the length of the animal to which the other measurements 
are proportional, and the dots the approximate positions of the centres of gravity of 
the testes. Such a figure well exhibits the concentration and transposition corre- 
sponding to higher grades of impulsiveness. To fully illustrate the relationship a 
similar diagram drawn up from several hundred dissections is necessary, together 
with the average weight of the testis and intensity of the reactions incurred in 
locomotion, appended in the case of each animal. 
