GLOSSARY. SYSTOLE THERMOMETER. 61 1 



mouary artery and pulmonary yein, which last is subservient to 

 respiration. 



SYSTOLE. Opposed to diastole, systole signifying the contraction of 

 the cavity of the heart or of an artery. See Diastole. 



TAPE-WORM. See Parasite. 



TEMPORARY GLANDS. Glands consisting of a sacculus, containing 

 cells and nuclei, which, having elaborated materials within their 

 cavities, discharge them by the absorption or dehiscence of their 

 walls, and then disappear. 



TESSELATED EPITHELIUM. The same as pavement epithelium, that 

 spread over the mouth, pharynx, and oesophagus, the conjunctiva 

 of the eye, the vagina, and entrance of the female urethra, <fcc., 

 being the most common variety of epithelium. 



THERMOMETER. The scale in Fahrenheit's thermometer, between 

 the freezing point and the boiling point of water, has 180 ; the 

 scale in the centigrade has 100 between the same two points 

 whence the degree in the centigrade is to the Fahrenheit degree in 

 length as 180 to 100. But in comparing a temperature mea- 

 sured by Fahrenheit with a temperature measured by a centigrade, 

 32 must be deducted from the number in the Fahrenheit no- 

 tation, because the zero of Fahrenheit begins at the temperature 

 produced by a mixture of snow and salt 32 below the tempera- 

 ture of freezing water. Thus the temperature of the human body 

 is 100 Fahrenheit: to find the corresponding temperature centi- 

 tigrade, 100 32 68. But the degree centigrade being longer 

 than the degree Fahrenheit in the ratio 180 : 100, expresses a 

 greater amount of heat. 



180 : 100 : : 68 : 37.75. 



The following formulae are also used to convert Fahrenheit into 

 centigrade, and vice versa : 



FAHRENHEIT TO CENTIGRADE. 



F. - 32 = C. 

 -I C. + 32 = F. 



Thus for animal temperature 



F. 100. 100 - 32 = 68 



-= 7.55. but 7.55 x 5 = 37.75. 

 9 



C. 37.77. 37.77 _ JM 



5 

 7.55 x 9 = 67.95 j 67.95 + 32 = 99.95. 



