264 



its activity about 12 lirs after having been collected, which proved, 

 according- to Drknman tiiat the exciting factor is highly labile and 

 that the dilution of the diabetic blood cannot be res[)onsible for the 

 result. HÉD0N, on the contrary, inquiring into the effect of transfusion 

 of blood by vascidar connection, from normal into diabetic dogs, 

 ascribes the decrease of sugar secretion in the diabetic animal only 

 to the dilution of the hyperglycemian blood, while he attributes a 

 strong inhibitory influence on the renal secretion to transfusion. 



My experience differs from Drenman's in that I did not detect 

 anything at all of a marked lability of the active factor in the 

 pancreatic blood ; anyhow, after more than 20 hours subsequent to 

 the removal of the blood, activity was still noted. This may be 

 only a quantitative difference, because in theory there are moi-e 

 active materials in the pancreatic blood than in the general circu- 

 lation. It also seems to me a sheer impossibility, to attribute the 

 results, reported here, to dilution of blood; first and foremost because 

 the quantity injected was too small in most cases ; secondly the 

 injection was subcutaneous, so that resorption was slow ; thirdly 

 the action was continued too long (on an average 2 days). In 

 concordance with Hedon's experiments I detected an influence 

 upon the renal secretion, not in such a marked degree, however, 

 that it could bear up my results. Lastly a permanent influence on 

 the N-elimination was demonstrated. 



Physics. ''Oil the Interpretation of [)liotosplieric phenuinena' . By 

 Prof. W. H. Julius. 



(Gominuniculed in the nieeling of May 31, 1913). 



§ 1. It is a common belief that a body always presenting the 

 appearance of a circular disk, from whichever side it is looked at, 

 must be bounded by a spherical surface. The general conviction 

 that the bulk of the sun is an incandescent sphere rests on that 

 belief, and was a natural starting-point for solar theories. 



After the effective solar temperature had been found so high as 

 to exceed the critical temperatures of perhaps all known substances, 

 the earlier idea that the main body of the sun was in the liquid 

 or the solid state had to be replaced by the hypothesis that it is 

 substantially gaseous. This new idea involved the necessity of 

 explaining the phenomenon of the apparent "solar surface". One 

 had to choose between Young's view, that the photosphere was a 



