230 



SUMMARY OF CURRENT RESEARCHES RELATING TO 



are not so brilliant as when the films are fixed at a temperature of 

 150° 0., they are generally extremely satisfactory. 



Simple Device for Carrying Minute Objects through the Grades 

 of Cedar Oil and Paraffin.* — C. S. Gage transfers from one grade of 

 cedar oil and paraffin to another by inclosing the object (pollinia of 

 Ascl&pias) in little bags, made by bringing together the four corners 

 of a square (1*5 in. by 1*5 in.) of cheese-cloth and fastening them by 

 one or two turns of small copper wire. One end of the wire is left 

 about one inch long and hooked at the free end. The bags can be sus- 

 pended by the hooks in the bottles of oil and paraffin and thence trans- 

 ferred from one to another. When the imbedding stage is reached, 

 the bags are cut from the wires, opened in the melted paraffin, and the 

 pollinia distributed as desired. By this device excessive handling is 

 avoided. 



(3) Cutting 1 , including Imb adding and Microtomes. 



Jung's New Student's Microtome. t — The frame g of R. Jung's 

 new pattern student's microtome (figs. 45 and 46) is fixed to the table 

 by means of a screw-clamp Kn. To the upright piece a which moves 

 on two screw-points s s, are attached the handle H and the knife- 



I-'ig. 45. 



carrier t with its clamping jaws a and h. To the base of g are fitted 

 the micrometer-screw m and the tube C, which serves as sleeve for the 

 object-holder and the freezing apparatus. The instrument can be used 



* Joum. App. Micr., vi. (1903) p. 2115. 



t R. Jung's Catalogue, 1902 (2 figs.); also Zeitschr. angew. Mikr., viii. (1902) 

 pp. 236-43 (2 figs.). 



