ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 153 



Walmsley, W. H— How to make Photo-micrographs. 



[" Plain and practical hints " ; dealing witli Microscopes, (any Microscope 

 with a joint can be employed, a monocular body is better than a bino- 

 cnlar, a rotating stage indispensable, and a centering substage a great 

 convenience— the eye-piece sliould be removed and the body-tube lined 

 with black flock paper), Objectives {supm, p. 145), Illumination (with 

 1/4 in. and liigher an achromatic condenser is necessary, otherwise a 

 bull's-eye is sufficient), and Cameras.] 



The Microscope, V. (1885) pp. 217-21 (see also p. 233), 271-4. 

 „ „ Photo-micrography by Lamp-light. 



New York Phot. Times. XV. (1885) pp. 274 and 289. 

 „ „ Photo-micrographs on Gelatine Plates for Lantern Pro- 



jection. 



[Title only of paper read at Ann Arbor Meeting of the Amer. Assoc. Adv. 

 Sci., 1885.] 



Ayner. Joim. Sci., XXX. (1885) p. 327. 



Walmsley's (W. H.) Photo-micro graphic Camera. 

 [Cf. Vol. III. (1883) p. 556 and post.'] 



New York Phot. Times, XV. (1885) pp. 703-4 (1 fig.). 

 Woodward, H. — [Microscopic research as applied to Palaeontology and 

 Mineralogy.] 



[Reference to this Society's work.] 



Geol. Mag., III. (1886) pp. 47-8. 

 WooLMAN, G. S. — See [Hitchcock, E.]. 



B. Collecting', Mounting and Examining Objects, &c.* 



Obtaining Diatoms from poor Material.f — Herr K. Miiller writes 

 that lie has " discovered a new system of obtaining specimens from 

 poor material. Take the material and dilute it well with water in a 

 bowl, and let it stand about a quarter of an hour. The mud must be 

 well stirred in the water so that it looks like muddy water. Let it 

 stand and rest again. The heavy mineral particles will sink down. 

 After a quarter of an hour the water will be clear again, but on the 

 top all vegetable particles will float. If you have a small, fine sieve, 

 pour the water through, and all the rough parts will remain in the 

 sieve, while the diatoms will go through and will float on the surface 

 of the water ; let it stand about a quarter of an hour, when the 

 diatoms will have settled on the edge of the plate, and there form a 

 greenish-black border, which you can take off and put under the 

 Microscope." 



Dissecting Trough.— Mr. E. J. Harvey Gibson, M.A., F.E.S.E., 



Demonstrator of Zoology, University College, Liverpool, describes 

 the dissecting trough which he has devised as follows : — 



" As is well known to naturalists, dissection is much more easily 

 and successfully accomplished under water, the tissues being thereby 

 floated up and supported. At the same time it is absolutely essential 



"' This subdivision contains (1) Collecting Objects ; (2) Preparing, (a) in 

 general, (b) special objects ; (3) Separate processes prior to making sections ; 

 (4) Cutting, including Imbedding and Microtomes; (5) Staining and Injecting; 

 (6) Mounting, including preservative fluids, cells, slides, and cabinets ; (7) Ex- 

 amining objects, including Testing ; (8) Miscellaneous matters. 



t Araer. Mon. Micr. Journ., vi. (1S85) pp. 230-1. 



