Relation of Suprarenals to Ovulation. 279 



If the appearance of hen-feathering in normal males as a con- 

 sequence of thyroid feeding is dependent on the presence of lutear 

 cells, it remains to consider the nature of the relation between 

 thyroid and lutear tissue. The former might lead to an augmenta- 

 tion either of the mass or the activity of the latter, or both. There 

 is no evidence as yet of an increase in the mass or number of lutear 

 cells in the testis of thyroid-fed males. The second alternative, 

 for which direct evidence is far less easy to obtain, may yet prove 

 to be the correct one. 



121 (1868) 



The relation of the diffusion constant to mountain sickness. 



By GEORGE HARROP (by invitation). 



[From the Presbyterian Hospital, New York City.] 



In connection with the recent physiological expedition to 

 Peru, a series of determinations were made of the gas diffusion 

 constant by the CO method described by Dr. Marie Krogh. 1 

 A series of preliminary determinations made at sea level agreed in 

 the limits of error (5 per cent.) with those made at Cerro de Pasco, 

 at 14,300 feet. It was found that the severity of the symptoms 

 of mountain sickness, or seroche, exhibited by the eight members 

 of the party were in direct proportion to the value found for their 

 diffusion constants, those having values of over 40 suffering very 

 little, or practically not at all. 



table a. 



Determination of Diffusion Constant — CO Method. 

 Cerro de Pasco, Dec. 27-Jan. 10, '22 — 14,300 Feet. 



Subject. 



K. 



D02. 



Clinical Phenomena. 



H 



5-50 



25-4 



Severe seroche, 3 days, symptoms chiefly nervous. 



Bo 



6.03 



31-8 



Severe seroche, 6 days, symptoms gastric and 









nervous. 



Ba 



8.44 



36.0 



Moderately severe seroche, 2 days in bed. 



Bi 



9-3 



38.3 



Moderately severe seroche, 2 days in bed. 



D 



5-91 



4i-5 



Practically symptom free throughout stay. 



R 



6.85 



42.9 



Some headache; otherwise symptom free. 



F 



6.01 



43-8 



Practically symptom free. 



M 



9.80 



45-6 



No effects from seroche. 



1 Jour, of Physiol., 1915, xlix, 271. 



