274 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Peingsheim's Photochemical Microscope. 



Quart. Journ. Micr. ScL, XXII. (1882) p. 86. 

 S., H. C. — An " English Mechanic " Microscopic Club. 



Engl. Mech., XXXIV. (1882) p. 615. 

 Salt's and Swift-Brown Microscopes. 



Eiifil. Mech., XXXIV. (1882) p. 463 (3 figs.). 

 Schroder, H. — Ueber Projektioiis-Mikroskope. (On Projection Microscopes.) 

 Centr. Ztg.f. Optik u. Mech., III. (1882) pp. 2-4, 15-17 (1 fig.). 

 Shipperbottom, W. — Improvements in Photo-micrography. 



North. Microscopist, II. a8S2) pp. 48-9 (2 figs.) p. 75. 

 „ „ Use of the ' Aperture-shutter ' in Photo-micrography. 



North. Microscopist, II. (1882) p. 75. 

 Slow motion for Micro. Stand. 



[Letter by ' Sunlight,' describing the ordinary form used with the 

 ' Jackson Model.'] 



Engl. Mech., XXXIV. (1882) p. 457 (1 fig.). 

 Stallybrass, H. M. — Microscopic Illumination. 



[Approval of P. Kitton's Hollow Glass Sphere Method, I. (1881) pp. 112-3 

 — by adding a few drops of pure sulphuric acid, cloudiness of the liquid 

 is prevented.] 



Sci.-Gossip, 1882, p. 64. 

 Stoddeb, C. — Large vs. Small Stands. 

 [Eeply to R. Hitchcock's Criticism.] 



Amer. Mon. Micr. Journ., III. (1882) pp. 13-4. 

 Suffolk, W. T. — On Microscopical Drawing. Sci.-Gossip, 1882, pp. 49-50. 



TisSANDiER. — Microscopic Photograpliy in Paris. 

 [Abstr. of article from ' La Nature.'] 



Engl. Mech., XXXIV. (1882) p. 561. 



/3. Collecting, Mounting' and Examining Objects, &c. 



Injection of Invertebrate Animals.* — G. Joseph uses filtered 

 white of egg, diluted with 1 to 5 per cent, of carmine solution, for 

 cold injections. This mass remains liquid when cold ; it coagulates 

 when immersed in dilute nitric, chromic or osmic acids, remains 

 transparent, and is sufficiently indifferent to reagents. A mass of 

 similar properties is made of glue liquid when cold, coloured with 

 the violet extract of logwood reduced with alum. Injection is eflfected 

 in the case of worms (leech and earthvporm), by way of the ventral 

 or dorsal vessel, with large Crustacea by the heart or the ventral 

 vessel which lies in the sternal canal. 



In many cases, especially when lacunar spaces have to be filled, 

 useful preparations are obtained by natural injection {auto-injec- 

 tion, or autoflerosid). Natural injection of Medusae is effected 

 without injuring the vessels ; in the case of Crustacea, Insects, and 

 Mollusca, through a slit with an opening at the side remote from it. 

 Medusae are laid in a glass vessel, with the bell downwards, and a 

 bell-jar ending in a narrow tube above is placed over it and made 

 q,ir-tight ; after the Medusa is covered with the injection-mass, the 

 air in the glass is exhausted, and the sea-water running out by slits 

 in the lower side of the annular canal the coloured fluid runs in. 



* Ber. naturw. sect. Schles. Ges., 1879, pp. 36-40. Cf. Zool. Jahresber. Neapel 

 for 1880, i. pp. 45-6, 



