268 MORBID BODILY CONDITIONS 



gulls disgorge the contents of the stomach on being alarmed 

 (Montagu). The dog is sometimes 'violently sick 5 from 

 mental shock or from joy (Cobbe). 



4. Morbid motor phenomena include, further, various 

 aimless, frequently violent, movements, such as flying to and 

 fro in small cage birds under fright or fear movements that 

 involve dashing against all manner of obstacles, and that 

 lead thereby to self-injury, frequently of a fatal kind. The 

 kicking, rearing, plunging, of terror-stricken horses belong 

 to this category. So does the very different restlessness of 

 the terrier, accompanied by tail-shakes and whines, when he 

 intimates discovery of a rat and expresses his satisfaction 

 and eagerness. 



5. Brunton refers to movements of the lowels as signifi- 

 cant of, and produced by, love in parrots, and it is probable 

 that emotion acts in the same way on their peristaltic action 

 as it does in man. 



6. The development or evolution of electricity for in- 

 stance, from the bristling hairs of the cat under the excite- 

 ment of anger or fear. The animal or its fur becomes 

 6 charged ' with electricity. It is probably under similar 

 feelings of annoyance at being handled or touched, which 

 the animal may construe into indications of danger or at- 

 tack that the gymnotus and malapterurus discharge their 

 electricity ; for, as regards at least the gymnotus, we know 

 that it has its battery quite under control, and that it does 

 not use it when it is tamed and handled by its master. 



Of non-motor phenomena, among the most common are 



1 . Various cutaneous exudations, including especially per- 

 spiration or sweating ; and 



2. Strong odours of various kinds, mostly of a disgusting 

 character, attached or not to cutaneous exudations. 



3. The evolution of light or luminosity, especially in the 

 form of so-called phosphorescence. 



Profuse sweating under terror, and sometimes even under 

 various ordinary forms of excitement, is not uncommon in 

 the horse, while it occurs even in so unlikely an animal as 

 the rhinoceros (Darwin). Tristram tells us that at the sight 

 of the horned snake of Syria the horse not only trembles, 



