THE INNERVATION OF THE LUNGS. 455 



gen, but to form an oxidizing substance with the latter from 

 which haemoglobin can, in the lungs, become replenished with 

 oxygen. The entire set of analyses submitted in this work 

 so far, however, seem to us to have emphasized another fact: 

 i.e., that the plasma, and not the corpuscle, is the dispenser of 

 oxygen, the corpuscle being a mere carrier from which the 

 plasma itself becomes replenished as needed. As already stated, 

 this precisely coincides with the conclusion to which Jaquet 

 was led by chemical methods (see page 134) after Salkowski 

 (1881) had obtained oxidations from blood alone, which he 

 attributed, however, to the blood-corpuscles. Abelous and 

 Biarnes having obtained oxidation of salicylic aldehyde by 

 means of blood-serww, Salkowski modified his former view and 

 experimentally confirmed the results of the other investigators. 



Finally, we were able to show how closely connected the 

 suprarenal secretion is with the integrity of the blood, and 

 how readily the haemoglobin molecule becomes dissociated in 

 proportion as the efficiency of the adrenals becomes weakened. 

 We have traced this dissociation down to the last cleavage- 

 product, haematoporphyrin or haematoidin, the coloring pigment 

 in bronzing, which corresponds with the lowest stage of adrenal 

 insufficiency. 



The circulatory, nervous, and muscular mechanisms of the 

 lungs are the remaining features to be analyzed. 



THE INNERVATION OF THE RESPIRATORY SYSTEM. 



THE IDENTITY OF THE KESPIRATORY CENTER. The abso- 

 lute independence of the suprarenal system the adrenals 

 receiving their impulses from the anterior pituitary body is 

 well illustrated by the following lines by Professor Foster: 

 "Observations show that under particular conditions, and espe- 

 cially in young animals, respiratory movements may be carried 

 out in the entire absence of the medulla oblongata. Thus, if, 

 in a kitten or puppy or young rabbit, after division of the 

 spinal cord below the medulla artificial respiration be kept up, 

 and then pauses be made in the artificial respiration, during 

 these pauses not only may what appear to be respiratory move- 

 ments be induced in a reflex manner, by pinching or by blow- 

 ing on the skin, but, especially if the excitability of the spinal 



