PRODUCED BY MENTAL CAUSES. 269 



but perspires in every limb. Perspiration is a ph} r sical effect 

 of the excitement of swarming in bees (Huber). Various 

 poisonous cutaneous exudations are the result of irritation 

 in certain animals. 



The development of disgusting smells under alarm or 

 irritation is exemplified in snakes (Jesse), the pigmy shrew, 

 and certain other animals. 



Foaming or frothing at the mouth in fury or rage occurs 

 in the dog ; and indeed the expression ' foaming with rage ' 

 is sometimes more applicable to other animals than to man. 

 It must, however, be distinguished from the mouth-foaming, 

 the saliva-churning of disease, such as epilepsy. 



Starting, protruding eyeballs are various expressions of 

 terror, hatred, ferocity. 



To man practically the most important of the physical 

 effects of emotional or mental disturbance are the 



1. Vitiation of the quality, changes in the chemical com- 

 position, of various of the principal solid and fluid consti- 

 tuents or secretions of the body of an animal to wit, the 

 blood, flesh, and milk especially those solids and fluids that 

 are so largely used as human food ; and 



2. Diseased general conditions such as feverishness or 

 specific diseases in great variety, many of them dangerous 

 to man, or involving great pecuniary loss to him. 



None of the animal secretions is so important economi- 

 cally to man as the milk of the cow, goat, and certain other 

 animals. Now, in the first place, milk may be given up or 

 refused according to the humour or temper of an animal, 

 according as it is angry, sulky, revengeful, or pleased, con- 

 tented, happy according as its usage has been kind or cruel, 

 its owner, master or attendant judicious or the reverse. 

 Cows and goats have a wonderful control over the secretion 

 of milk, and over the giving up of that secretion. They 

 refuse to give it up to, to allow themselves to be milked by, 

 strangers or persons they dislike. They are easily irritated 

 or excited, and when so, refuse to be milked (Pierquin). 



This unwillingness to yield their usual milk-supply to man 

 is sometimes overcome by him by the use of various expe- 

 dients, and some at least are of such a character that their 



