GLOSSARY. 175 



Hsemauto'graphy (Gr. haima, blood; autos, oneself; grapho, 

 I write). A method of taking a pulse curve directly from 

 an opening in an artery, the blood spurting on to a 

 moving surface. 



Hae'min (Gr. haima, blood). Hydrochlorate of hsematin. 



Haemochro'mogen (Gr. haima, blood ; chromes, colour ; ge?mao, 

 I produce). Unoxidized hsematin, the first product in 

 the decomposition of haemoglobin. 



HaD'moglo'binometer (a hybrid Gr. haima, blood ; 'L.globus, 

 a round body ; metron, a measure). An instrument for 

 estimating the amount of haemoglobin. 



Haidinger's brushes. Phenomena observed on looking 

 through a Nicol's prism at a white cloud: due to in- 

 fluence of yellow spot. 



Hassall, Corpuscles of Large cells found in thymus gland. 



Hay's test. Demonstrates the influence of bile in diminish- 

 ing surface tension of fluids. 



Heat unit. The amount of heat required to raise one gramme 

 of water i centigrade. Also called " Caloric." 



Hemialbumose. A stage in the conversion of a proteid into 

 peptone. 



Hemipeptone (Gr. hemisus, the half; pepto, I digest). A 

 variety of peptone which is converted into leucin and 

 tyrosin by trypsm. 



Henle's loop. Part of uriniferous tube. 



Henle's membrane. The fenestrated elastic inner coat of 

 artery. 



Hesselbach's triangle. A region of abdominal wall, con- 

 cerned in inguinal hernia. 



Hetero'logous stimuli (Gr. heteros, different; logos, dis- 

 course). Stimuli which will excite a sensory nerve 

 when applied either to its termination or in its 

 continuity. 



Hippu'ric acid. An *acid found in urine derived from 

 nitrogenous food. Formed by union of benzoic acid 

 and glycin. 



Holobla'stic (Gr. holos, the whole ; blastana, to mould). That 

 variety of ova in which the whole of yolk shares the 

 segmentation process. 



Homoeother'mic (Gr. homoios, like ; therme, heat). Of even 

 temperature : applied to warm-blooded animals which 

 maintain the same temperature, irrespective of that of the 

 surrounding medium. 



