ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 837 



In an article on " Liquid Films and Molecular Magnitudes " * 



A, W. Eeinold and A. W. liiicker give the results of their measurements 

 of soap films in the last stage of tenuity, and in which, referring to 

 Sir W. Thomson's lecture, they say : " If the size of the molecules of 

 which the liquid is composed is between 2 x 10"" and 1 x 10~* mm. 

 (the limits given by him) it follows that the thinnest film measured 

 by us, which was 7 • 2 x 10"'^ mm., must contain not less than 3 and 

 not more than 720 molecules in its thickness. The smallness of the 

 smaller of these numbers tends to show that the real size of the 

 molecule is considerably below Sir W. Thomson's superior limit." 



B. Sc. — DiflQculties in Mounting. 



[To avoid air-bubbles in glycerine cell-mounting. — Varnish t^vice at 

 intervals of a couple of hours with a solution of shellac in alcohol and 

 then finish oflf with ordinary bitumen.] 



Sci.-Gossip, 1884, p. 212. 

 Baumgarten, p. — Ueber Untersuchungsmethoden zur Unterscheidung von 

 Lepra- und Tuberkel bacillen. (On methods for distinguishing Leprosy and 

 Tubercle Bacilli.) Zeitschr.f. Wiss. Mikr., I. (1884) pp. 367-71. 



„ „ Ueber eine gute Farbungsmethode zur Untersuchung voa 



Kemtheilungsfiguren. (On a good staiuing method for investigating the 

 figures in the division of nuclei.) {^PostJ] 



Zeitschr.f. Wiss. Mikr., I. (1884) pp. 415-7. 

 Beecheb, C. E. — A New Design for a Microscope Cabinet. [Post.'] 



Amer. Mon. Micr. Journ., V. (1884) pp. 12G-7 (1 fig.). 



Bell, J. — The Chemistry of Foods. 



[I. Tea, Coffue, Cocoa, Sugar, &c. II. Milk, Butter, Cheese, Cereal foods, 

 &c.] 8vo, London, 1884. 



Bonnet, K.—Kurzgt'fasste Anleitung zur mikroskopischen Untersuchung thie- 

 risfher Gewebe fiir Anfanger in der histologischen Technik. (Condensed 

 Guide for the Microscopical Investigation of Animal Tissues for Beginners 

 in Hibtological Technic.) 8vo, Miinchen, 1884, 61 pp. and 2 figs. 



Chase's (H. H.) Amphipleura pellucida and other test-objects mounted in a 

 medium of refractive index 2 "42. Amer. Mon. Micr. Journ., V. (1884) p. 159. 



Cole, A. C. — Methods of Microscopical Research. Part XIII. pp. Ixxiii.-lxxxiii. 

 On Photo-miercjgiaphy. Plate of T. S. Spine of Echinus under (4) various 

 conditions of illumination — 1 fig. 

 „ „ Popular Microscopical Studies. No. XII. pp. 5.3-6. Tiie Dodder- 

 plant. PI. 12. T. S. of Dodder (^Cuscuta) in its host, double stained x 75. 

 „ „ Studies in Microscopical Science. 



Cf. Micr. News, IV. (1884) p. 242. 

 Vol. II. No. 23. Sec. I. No. 12. pp. 45-8. Human Cerebrum. Plate 12. 

 No. 24. Sec. 11. No. 12. pp. 47-50. Secondary Tissue. PI. 12. T. S. 

 Stem of Maple showing annual rings x 60. 



Cox, C. F. — Cement for Mounting. 



[Correction as to the material he employs for his finishing cement.] 



Amer. Mon. Micr. Journ., V. (1884) p. 140 (cf. also p. 132). 



Davi.s, G. E. — The President's Address. 



[Deals with "the use of tlie various processes in connection with micro- 

 scopical manipulation which have been so universally employed during 

 the past few years" and " the past history of the Microscope.''] 



Ann. Rep. Manchester Micr. Soc, 1883-4, pp. 60-72. 



* Nature, xxviii. ri883) pp. 380-03 (2 figs.\ See idso Proc. Roy. Soc, 

 XXXV (1883) pp. 140-51. 



