PRACTICE OF MEDICINE AND HYGIENE 



have their bellies shaved and scarified, and 

 then visited by the bother of having their health 

 and cleanliness protected while they graze all 

 more or less of a nuisance to a frisky heifer 

 calf. 



In eastern Europe, India and some other Relapsing 

 countries is found a disease called relapsing fever, 

 fever, due to a parasite which enters the blood 

 through the bite of an insect. This disease can 

 be transmitted to rats and other animals, in 

 which it has been studied most successfully. 

 Immunity has been produced experimentally, 

 and curative sera prepared. Certain chemicals 

 also have been found to have curative power. 



There is a peculiar disease called myxedema, Myxe- 

 the nature of which until recently was un- dema. 



/ 



known. It is characterized by a puffiness of 

 the skin and by mental hebetude ; and it defied 

 treatment. It was studied by Sir William 

 Gull. An independent worker, Sir Victor 

 Horsley, making animal experiments at Brown 

 Institute in London, removed under chloro- 

 form the thyroid glands from monkeys. He 

 observed peculiar constitutional changes simi- 

 lar to those observed by Schiff. The animals 

 became stupid and inactive and developed a 

 strange puffiness of the skin. Schiff had cured 

 3 99 



