ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 423 



DiTTMAR, W. — Mikroskopische Ablesevonichtung fiir feine Waagen. (Micro- 

 scopical reading apparatus for fine balances.) 



[Recommends a Microscope for reading off the scale.] 



Zeitschr. f. Instrumentenk., II. (1882) pp. G3-4. 

 " English Mechanic " Microscopical yociety. 



rSuggestions for working the proposed Society.] 



Engl. Mech., XXXV. (1882) p. 195. 

 Ermengem, E. van. — Tlie Vertical Illuminator. 



[Transl. of paper in 'Bull. Sec. Belg. Micr.,' ante, p. 266.] 



Amer. Mon. Micr. Journ., III. (1882) pp. 48-9. 

 Flesch, M. — Einfache Vorrichtung zum WiederaufQuden wiclitiger Stellen 

 in Mikroskopischen Pr'aparaten. (Simple contrivance for finding again important 

 points in microscopical preparations.) \_Supra, p. 409.] 



Arch.f. Mikr. Anat, XX. (1882) pp. 502-3 (1 fig.). 

 „ „ Ueber einige Verbesserungen an Seibert und Krafi't's Mikroskop- 



Stativ. (On some improvements in Seibert and Krafi^t's microscope-stand.) 



[The tube, instead of sliding in a socket, moves by a pinion on a brass 

 plate, the edges of which slide in grooves attached to the tube (similar 

 in short to tlie usual English plan). This allows the tube to be more 

 securely fixed and to be raised higher from the stage when low powers 

 are requiied. The analyzer and polarizer can also be more readily 

 placed in any given relative position. The tube is blackened inside.] 

 Arch.f. Mikr. Anat., XX. (1882) pp. 504-5. 

 Hardy, J. D. — On an improved Compressorium. 



Joiirn. Quek. Micr. Club, I. (1882) pp. 35-6, 51-2 (2 figs.). 

 Hedkck, H. van. — La lumiere electrique applique'e aux recherches de la 

 micrographie. (The electric light applied to microscopical researches.) 

 [Supra, p. 418.] 



Bull. Soc. Belg. Micr., VII. (1882) pp. Ixii.-lxxiii. (3 figs.). 

 Sep. repr. also with additional note on the new Regnier Battery. 

 Hitchcock, R. — Binocular Microscopes. \_Supra, p. 416,] 



Amer. Mon. Micr. Journ., III. (1882) pp. 45-8 (8 figs.). 

 „ „ About Stands. 



[Reply to query of the Editors of the ' Botanical Gazette,' (" . . . Is it a 

 fact that the extra appliances, &c., are more things of ' fuss and feather ' 

 than fruitful additions to biological laboratories ? ") That some ac- 

 cessories are certainly important, but there is a long list of them which 

 embraces many that are quite useless, and very many others that are 

 mere conveniences. Some few are almost indispensable, and Microscopes 

 should be purchased with substages in every case.] 



Amer. Mon. Micr. Journ., III. (1882) p. 54. 

 „ ,, A New Form of Vertical Illuminator. [Supra, p. 409.] 



Amer. Mon. Micr. Journ., III. (1882) pp. 54, 78. 

 „ „ " The Microscope." 

 [Further remarks as to Prof. Stowell's Journal.] 



Amer. Mon. Micr. Journ., III. (1882) p. 58. 

 ,, „ The Microscope in Medicine. 



[Complaint of the want of interest in practical Microscopy among 

 Physicians.] ^^^^^^ ^^^_ j^.^^_ Journ., III. (1882) pp. 75-6. 



,, „ Ruled Linas as Tests. 



[" Resolving power alone is not a test to be depended on."] 



Amer. Mon. Micr. Journ., III. (1882) pp. 77-8. 

 Holmes, E. — What is the meaning of x ? 



[Reply to T. R. J. infra who " is confusing himself needlessly." " If a 

 drawing of a man 5 feet high be made 20 feet he is x 4 whether the 

 grain of his skin becomes visible or not."] 



Sci.-Gossip, 1882, p. 114. 

 J., T. R. — What is the meaning of the sign x ? 



[Points out the error in describing a drawing as X 500 when it ii drawn 

 from an object X 50, and the drawing enlarge^l 10 times — " unless there 

 be detail corresponding with the amplitude the object is not x so 

 many diameters."] Sci.-Gossip, 1882, p. 89. 



