PROCEEDINGS OF SOCIETIES. 163 



listed in the Eoyal Microscopical Society's ' Transactions,' February, 

 1870, vol. i. p. 92, points out Hartnack's error, and observes, in place 

 of elongated hexagons represented by this optician, and copied without 

 comment by Dr. Carpenter, the frustule " is analogous to that of the 

 Grammatophora suhtiUssima, and with Hartnack's immersion tV^^ ^^^^ 

 latter frustule" appears to be similar to G. marina, or P. angulatum. 

 Mr. J. Mayall subsequently convinced Hartnack of the error into 

 which he had fallen, and concludes his paper with these words, 

 " Stirirella gemma may truly be called a touchstone for a high- 

 power objective." I should add that Dr. Woodward's admirable micro- 

 photographs of this and other frustules, are more nearly perfection 

 than anything I have ever seen. 



Tours, &c., 



J. Hogg, 



Hon. Sec. Eoyal Microscopical Society. 



PKOCEEDINGS OF SOCIETIES.* 



Biological and Microscopical Section of the Academy op 

 Natural Sciences, Philadelphia. 



At a stated meeting held April 3rd, 1871, the Director, S. Wier 

 Mitchell, M.D., in the chair,— 



A donation was received from the Surgeon-General's office at 

 Washington of Colonel J. J. Woodward's interesting report, entitled 

 " A Memorandum of the Test Podura," with five i3hoto-microgi'aj)hs. 



Dr. James Tyson exhibited slides of the deposit from two speci- 

 mens of urine from a case of so-called intermittPMt hcematuria, which 

 were interesting, if not important, from the fact, that the first speci- 

 men, though containing gTanular casts, did not contain blood cor- 

 puscles, and that the second, between the discharge of which and the 

 first the urine had become quite clear, contained, in addition to 

 granular casts, blood corpuscles and blood casts. 



The importance of this observation lies in the circumstance that 

 in the cases of intermittent htematuria reported by Harleyf blood 

 corpuscles were exceedingly rare, being found in a single case, and 

 not more than one or two in the field of the microscope. So rarely, 

 indeed, have corpuscles been j)resent, that Dr. Beale, in the first 

 volume of ' The Practitioner,' August, 1868, says : " It is, therefore, 

 improbable that in these cases there is any hemorrhage, as in acute 

 inflammation of the kidney, and they ought not to be spoken of as 

 cases of hfematuria." 



* Secretaries of Societies ■will greatly oblige ns by writing their reports legibly 

 — especially by printing the technical tenns thus : H y d r a^and by " underlining " 

 words, such as specific names, which must be printed in italics. They will thus 

 secure accuracy and enhance the value of their proceedings. — Ed. ' M. M. J.' 



t ' Medico-Chirurgical Transactions,* vol. xlviii., 1865. 



