94 



Scientific Proceedings (28). 



It seems to us possible that thymonucleic acid consists not of 

 a tetra- but of a penta-phosphoric acid. On this assumption and 

 on further assumptions that the oxypurins and oxypyrimidins form 

 anhydrids with the corresponding sugars, one would deduce the 

 following formula for nucleic acid : C 34 H 71 N, 0 O 37 P 5 . 



Calculated. Found by Levene in 1905. 



C 37-0 % C 37.78 % 



H 4.0 H 4.86 



N 16.0 N 16.51 



P 9.0 P 8.91 



55 (3") 



Regarding the innervation of the blood vessels of the kidney. 



By R. BURTON-OPITZ and DANIEL R. LUCAS. 



\From the Physiological Laboratory of Columbia University , at the 

 College 0/ Physicians and Surgeons.] 



The blood flow through the left kidney was determined by 

 means of the stromuhr described previously. 1 Having determined 

 that the left splanchnicus major, as well as the plexus renalis, con- 

 tains vaso-constrictory fibers for the corresponding kidney, different 

 fibers of the plexus were isolated and stimulated separately. Of 

 five nerve-fibers tested, four proved to be constrictory and one 

 dilatory. The constricting fibers displayed different grades of 

 effectiveness. 



By cutting the fibers composing the plexus, a faster blood flow 

 was obtained. Cutting the nervi vagi in the neck produced a 

 slowing of the renal bloodflow. Division of these nerves above 

 the diaphragm did not seem to change the flow very markedly. 



In another series of experiments the right splanchnicus was 

 stimulated while the bloodflow through the left kidney was being 

 measured. The results indicate that the innervation of the kid- 

 ney is bilateral. Although stimulation of the right splanchnic 

 produced a vaso-constriction in the left kidney, the effect was much 

 weaker and more gradual than when the left nerve was used. 



1 Burton-Opitz : This journal, 1907, iv, p. 24. 



