500 ON THE FEMORAL GLAND OF ORN ITHORHYSCHUS. 



Fig. 2. — Section of gland of animal killed April, 1892. 



a., Small alveolar cell (nuclei round) : /*., fibrous tissue of stroma ; c, 

 fibrous layer of capsule ; d., muscular layer of capsule ; ee., bloodvessels. 



Plate XXXI. 



First portion of tracing obtained in Experiment iv. 



Above is the record of respiration in which the downstrokes represent 

 inspiration and the upstrokes expiration. Underneath this, is the record 

 of the blood pressure in the carptid artery. At the point * the injection 

 was given as described in the text. The time occupied, by the injection is 

 represented by the raising of the signal line (v). 



