36 



forvvards so as to form a projection instead of a hollovv: the animal 

 is, 011 such occasions, delighted to t'nrust repeatedly the naked lining 

 of the sac against any substance that is offered to him, which soon 

 becomes loaded \vith the odour that has been referred to as belonging 

 to the secretion. In the secnnd individual, although it is perfectly 

 mature, the protrusion of the inner surface of the sac is not quite to 

 so great an extent as in the more aged malė ; and the less thickened 

 edges of the sinus allovv of a nearer approximation to its closure in 

 the uncKciled statė of the animal. The youngest malė has the lips 

 of the sinus small and closely applied to each other, so as to hide 

 completely the whole of the internal lining of the sac, and to exhibit, 

 externally, a mere fissure : in it the lips are but slightly moved when 

 the animal is interested. The emasculated individual, notvvitbstand- 

 ing its fuU grovvth, has its suborbital sinus nearly in the šame condi- 

 tion as that of the immature malė : it is merely a slight fissure, the 

 edges of vvhich are closely applied to each other; and in it those 

 edges do not appear to be at ali moved, the animal being generally 

 careless and inanimate. It would consequently seem that the šame 

 cause which induced the retention, by this individual, of its immature 

 colours, and vvhich arrested the perfect grovvth of its horns, was ade- 

 ąuate also for the checking of the developnient of the suborbital sinuses. 

 Those organs, therefore, vvould appear to be dependent on sesual per- 

 fection ; and consequently to be, in some manner yet to be ascertain- 

 ed, subservient to sexual purposes, vvith the capacity for vvhich they 

 are evidently, in the phases of their development, essentially con- 

 nected. 



Mr. Ovven, who had conceived it possible that the secretion of 

 these glands, vvhen rubbed upon projecting bodies, might serve to di- 

 rect individuals of the šame species to each other, remarked that he 

 had endeavoured to tęst the probability of this supposition by pre- 

 paring a tabular vievv of the relations betvveen thehabits and habitats 

 of the several species of Antelopes, and their suborbital, maxillary, 

 post-auditory, and inguinal glands ; in order to be able to compare 

 the presence and degrees of development of these glands vvith the 

 gregarious and other habits of the Antelope tribe. He stated, how- 

 ever, that it was evident from this table, that there is no relation be- 

 tvveen the gregarious habits of the. ^H/e/opes vvhich frequent the plains, 

 and the presence of the suborbital and maxiliary sinuses j since these, 

 besides being altogether vvanting in some of the gregarious species, 

 are present in many of the solitary frequenters of rocky mountainous 

 districts. The supposition, therefore, that the secretion may serve, 

 vvhen left on shrubs or stones, to direct a straggler to the general 

 herd, falls to the ground. 



Mr. Ovven's Table is as foilovvs : 



