500 Mr. C. Creighton on the Suprarenal [Dec. 6, 



a minute or two fallen with a well-marked " water-hammer " click. No 

 gauge was attached to the pump. We do not, of course, regard such a 

 vacuum as perfect ; but it was sufficient for our purpose, and, as regards 

 the Pasteur solution, proved fatal to the contained organisms. 



In the experiment of which Obs. 3 is here given as an example we 

 observe, on the one hand, the prevention of bacterial development and 

 consequent growth of mycelial forms (the quantity of light being insuf- 

 ficient for the destruction of these) in those tubes which were insolated in 

 the presence of ordinary atmospheric air. On the other hand we see 

 specimens of the same urine insolated to precisely the same degree as the 

 former, but, in the absence of an atmosphere, becoming turbid, even in vacuo, 

 with Bacteria as early as their encased congeners. 



This remarkable fact, then, appears to follow as a deduction, that a 

 vacuum (or approximation to such) which of itself is a condition 

 antagonistic to the development of Bacteria, nevertheless shields these 

 organisms from the germicidal effect of light *. 



It is not our present purpose to speculate on the interpretation of the 

 phenomena here presented, nor should we be justified in so doing until 

 we have further extended our observations, and more fully confirmed the 

 curious results here provisionally detailed. 



IV. " Points of Resemblance between the Suprarenal Bodies of 

 the Horse and Dog, and certain occasional Structures in the 

 Ovary By Charles Creighton, M.B., Demonstrator of 

 Anatomy, Cambridge University. Communicated by Pro- 

 fessor Humphry, F.R.S. Received October 12, 1877. 



(Abstract.) 



The object of this communication is to prove, with the aid of accurate 

 drawings, that there exists an essential resemblance between the con- 

 stituent parts of the suprarenal bodies of mammals and certain structures 

 in the mammalian ovary that are of occasional but normal occurrence. 

 The appearances on which the comparison is based aie best seen in the 

 suprarenals of the dog and horse, and in the ovaries of the bitch. The 

 suprarenals of the horse and dog are known to have, immediately under 

 the fibrous tunic, a zone of follicles of singular though well-defined struc- 

 ture. The first point in the communication is one of criticism, and has 

 reference to the division of parts within the suprarenal. It is held that 

 the outer zone of follicles, as they are seen in the horse and dog, are 

 quite unique among the structures composing the suprarenal, and are 

 broadly contrasted with the rest of the organ lying internal to them. 

 The contrast is unmistakable in these two animals, and it is equally 



* We wish, however, to make it clear that we by no means insist on this explana- 

 tion ; the facts, indeed, admit of other explanations. 



