1886.] 



MICEOSCOPICAL JOURNAL. 



99 



The normal or inflamed cornea is 

 to be treated by a combination of 

 silver and haematoxylin. First a 

 ^-1% sol. silver nitrate, then v^ash 

 and expose 1-3 hours to the action of 

 htematoxylin. 

 237. Toole. A double staining with 



Htematoxylin and Anilin. 



Quart. Journ.Micr. Sci., 1875, 



P- 375- 

 Brain sections are placed for 34 

 hours in haematoxylin washed in alco- 

 hol and water, then for ^-J minute 

 in anilin blue. After a second wash- 

 ing in alcohol, mount in balsam and 

 the nuclei and cell substance will be 

 difterentiated. 



23S. Bevan Lewis. See No. 94. 

 Brain sections are put first in 

 haematoxvlin, then in anilin 

 black. (Sankey's anilin blue 

 black, No. 93.) 



[Zb be continued.^ 



NOTES. 



— Dr. George A. Piersol has favored 

 us with a photograph of Bacilhis tubcf- 

 ciilosis, magnified 1,000 diameters, in 

 which the bacillus is shown as clear 

 and distinct as when viewed with the 

 microscope. It is far superior to any- 

 tliing of the kind we have hitherto seen, 

 but it is a result we have been anticipa- 

 ting for some time. In the present state 

 of photography it may be confidently 

 asserted that whatever can be seen can 

 also be photographed, although it may 

 sometimes require rather more knowl- 

 edge and skill than is possessed by the 

 ordinary operator. Dr. Piersol will in 

 due time describe his method of working 

 in these columns, and the article may be 

 expected at an early day. It will cer- 

 tainly prove of interest to many workers 

 in this field. 



— Mr. Richard Jackson, of Leeds, Eng- 

 land, announces the proposed publication 

 of a monograph on The Desmidea;, by W. 

 Barwell Turner, F.R.S., F.R.M.S., etc., 

 to be published in about twelve quarterly 

 parts, of 60-80 pages, with 1 5-20 plates 

 each, at \os. 6d. per part. The publica- 

 tion is made conditional upon receiving 

 a sufficient amount of subscribers before 

 October next. 



— Dr. A. C. Stokes has prepared for 

 his own use a key to Mr. WoUe's Des- 

 mids of the United States, which he has 

 found so useful that he has decided to 

 send it to us for publication in the Jour- 

 nal. We shall probably have the manu- 

 script in time for our next issue, and it 

 will be published as soon as possible. 

 We doubt not it will be of great assist- 

 ance to the finders of desmids. 



MICROSCOPICAL SOCIETIES. 



Washington, D. C. 



Forty-second Regular Meeting. 



Mr. F. A. Chapman exhibited a light- 

 interruptor, a mechanism devised to pro- 

 duce an intermittent light for viewing rap- 

 idly vibrating cilia. The intermission of 

 the light is produced by the rapid rotation 

 of a diaphragm - plate just beneath the 

 stage, by means of a small dynamo-elec- 

 tric motor. The construction of this de- 

 sign was suggested by a paper by Dr. 

 Geo. Hopkins in the Scientific Ai)ierican. 



Mr. Chapman also exhibited a 2-inch 

 objective of 20° angular aperture, by 

 Bausch & Lomb, which was remark- 

 able for the flatness of its field. Dr. 

 Howland spoke of an Oberhauser lens 

 some forty years old, which he had 

 found to be of the highest excellence 

 for photographic work. 



Prof. Seaman, for the purpose of show- 

 ing the permanency of such mounts, ex- 

 hibited specimens of uric acid which had 

 been mounted in benzole balsam for sev- 

 eral years without change. He also spoke 

 highly of such mounts in copavia balsam. 



Forty-third Regular Meeting. 



Mr. R. Hitchcock laid before the So- 

 ciety a letter which he had received from 

 Mr. Kruttschnitt, of New Orleans, trans- 

 mitting two slides of a vegetable substance 

 brought up from an artesian well at a depth 

 of from nine hundred to one thousand feet. 

 The specimens were mounted in chloro- 

 form camphor water. Mr. Knowlton took 

 the slides for examination and report. 

 Mr. Hitchcock also showed the following 

 specimens gathered from a pond near the 

 Great Falls of the Potomac : Spirogyra 

 calospora in fruit ; C lostcriicm acerosum 

 with zygospores ; Zyg7ieina insignis in 

 fruit, and Spirogyra qitinina in fruit. 



He then described the different meth- 

 ods of conjugation and spore formation 

 of the conjugatas, and gave an outline 

 of Wittrock's classification. 



