304 SUMMARY OF CURRENT RESEARCHES RELATING TO 



ings in question could only be seen by enlarging the dioptric beam, and 

 cutting out the six spectra. 



Here, again, there was evidently something wrong in Mr. Nelson's 

 ideas, as Mr. Stephenson used only a very narrow beam, and nono of the 

 six spectra were cut out. 



In his now paper Mr. Nelson, never having revised his original pre- 

 misses, falls into the old blunder over again. Referring to plate III. 

 of the present volume of this Journal, he inquires " what has become of 

 Dr. Eichhorn's fantastic diagram ? " and " supposes that the officers of 

 the R. M. S., since writing their strictures on my paper, have changed 

 their minds, and have adopted Dippel's picture, which is similar to mine." 



We are afraid that wo shall only be adding to Mr. Nelson's present 

 bewilderment when we point out that the fig. which he considers as 

 " similar to his," was laid before the Society many years back, and that it 

 emanated from the same authority as that of Dr. Eichhorn. Here again, 

 therefore, there must necessarily be something a little defective in Mr. 

 Nelson's ideas on the subject ! 



In our original comments we ventured to give a pretty broad hint as 

 to where Mr. Nelson had gone wrong, but he does not seem to have yet 

 found it out. The superficial way in which he approaches the matter 

 may be judged of by the fact that he treats as a " dictum of the R.M.S." 

 a statement in Prof. Abbe's original paper in Max Schultze's ' Archiv,' 

 translated and published by the Bristol Naturalists Society ! We are 

 sure if he would only sit down with a serious determination to master 

 the subject he would have no difficulty in finding where he has gone 

 wrong, and having found it would then laugh as heartily as other 

 microscopists do now at the absurdities into which he has allowed 

 himself to be led. 



Poli, A. — Sul modo di valutare ed indicare razionalmente gl' ingrandimenti del 

 Microscopio e delle imagini microscopiche. (On the mode of determining and 

 indicating correctly the amplification of the Microscope and microscopical images.) 



Extr. from Spallanzani, 1887, 11 pp. 

 „ „ Sulla misura dell' ingrandimento dei disegni degli oggetti microscopic!. 

 (On the measure of the amplification of the images of microscopic objects.) 



Atti Congress. Naz. Pot. Crittog. Parma, 1887, Proc. Verb., pp. 109-13. 



(6) Miscellaneous. 



American Postal Microscopical Club. 



[Satirical directions issued by the Club to meet new U.S. postal regulations ] 

 Queen's Micr. Bulletin, IV. (1887) p. 45. Cf. Microscope, VIII. (1888) p. 22. 

 Baltimore Microscopical Society. Microscope, VII. (1887) pp. 359-62. 



Brooklyn Microscopical Society. Journ. New York Micr. Soc, IV. (1888) pp. 96-7. 

 Central New York Microscopical Club. Microscope, VII. (1887) p. 364. 



Crisp, F. — Ancient Microscopes. 



[Friday evening lecture at Royal Institution on February 3rd, 1888.] 



Daily News, Feb. 4, 1888; Scientific Enquirer, III. (1888) pp. 44-6; 

 Morning Post, 1888, Feb. 4; Scientific News, I. (1888) p. 162. 

 Essex County Microscopical Society of New Jersey. 



Journ. New York Micr. Soc, IV. (1888) p. 97. 

 Local Microscopical Societies. Microscope, VIII. (1888) pp. 18-20. 



Louisville Microscopical Club. Microscope, VII. (1887) p. 364. 



Mayall, J., Jun. — Recent Improvements of the Microscope: a visit to Jena. 



19th Ann. Pep. Liverpool Micr. Soc, 1888, pp. 8-11. 

 Medical Microscopical Society of Brooklyn. 



Journ. New York Micr. Soc, IV. (1888) p. 97. 



