NOTES AND MEMORANDA. 121 



phenomena by which certain tropical diseases are characterized may 

 eventually be traced to the same, or to an allied, condition. The 

 importance of a careful microscopical examination of the blood of 

 persons suffering from obscure diseases, in tropical countries 

 especially, is therefore more than ever evident, and opens up a new 

 and most important field of inquiry — referring as it does to a hitherto 

 unknown diseased condition. 



NOTES AND MEMOEANDA. 



Microscopy at the Brighton Aquarium. — We learn that Mr. Lee, 

 F.L.S., who has had so much to do with this most successful institu- 

 tion, has inaugurated a very great and decided improvement in the in- 

 troduction of microscopes for the use of the public. There are few places 

 where microscopic objects in a very wide and important class can be so 

 well exhibited as in an aquarium. We think that Mr. Lee has done 

 well both for the public and the proprietors in the introduction of the 

 microscope to the general use of the visitors. 



Muscles in the Kidneys — Herr Eberth states in a German journal 

 that he has found a network of non-striated muscular fibres in the 

 outer portions of these glands. 



Pathological Microscopy. — Dr. Eindfleish's manual of pathological 

 histology has been translated into English by Dr. E. B. Baxter, of 

 King's College. We hope soon to be able to lay a notice of the book 

 before our readers. 



COKKESPONDENCE. 



Mr. Wenham's Examination or the American ^th. 



To the Editor of the ' Monthly Microscopical Journal? 



Sir, — Very lately I have seen Mr. Wenham's account of measure- 

 ment of the y y sent for test of angle when "immersed" in balsam. It 

 is extremely unsatisfactory and bald of any result. A little must be 

 said, and but little need be said as comment thereon. 



Mr. Wenham states that he adjusted the objective "for Podura," 

 no reference to cover of any thickness whatever. This is too indefinite 

 for anybody's use. The meaning, if anything, must be icitliout cover 

 (which is not likely), and that would be, at most open point, where 

 presumptively the angle of objective is least. 



At the point at which Mr. Wenham tested the objective, the angle 

 (air) was fouud to be 145°. Now, without a chance of question or doubt 

 the maximum angle of the T y is 175° at adjustment for maximum 

 angle. Measured at this point (obviously in all respects the proper 

 point), the balsam angle would have been found to be not 79°, three 

 degrees more than Mr. Wenham "predicted," but, using parallel rays 

 of slender sunbeam, 95°, as repeatedly obtained and verified by me. 



I have not the slightest objection to an adjustment "for Podura" 

 tinder a proper thickness of cover to require adjustment to point of 



