158 SUMMAEY OF CURRENT RESEARCHES RELATING TO 



Peticolas' (0. L.") New Slides of Diatoms. 



[" Slide No. 1, Stauroneis acuta. — Microscopists are familiar -with the beautiful 

 effects of dark -field illumination upon certain diatoms. Some peculiarities 

 of structure are shown by this method more clearly than by transmitted 

 light, A recent gathering of St. acuta (Pleurostaurum acutmn Grunow) 

 has given me a sensation, although I have practised this method of 

 illumination for years. With a 1/2 inch objective and a strong artificial 

 light on dark field, this diatom seems literally to blaze, and surpasses in 

 splendour the finest polariscope objects in my cabinet. With the light 

 thrown across the short diameter, there is a strong resemblance to a section 

 of ostrich tendon, only some peculiarity of striation seems to impart 

 motion to the light, and the diatom seems on fire ; across the long diameter 

 the colour is changed to a brilliant sapphire.] 



Amer. Mon. Micr. Journ., IV. (1883) p. 234. 

 PiLLSBURY, J. H. — A new Microscope Slide Cabinet. \^Post.'] 



Science Record, II. (1883) pp. 25-6 (2 figs.). 

 Queen, J. W. & Co.— Improved Slide Box. 



[Covered with cloth instead of paper ; inside of lid with numbered lines for 

 indexing.] 



Micr. Bulletin, I. (1883) p. 7 (1 fig.). 

 R., D. — Classification and Labelling of Mi't-roscopical Objects. 



[Suggestion that locality should be added to I. 0. Thompson's labels, Vol. III. 

 (1883) p. 926.] 



Sci.-Gossip, 1883, p. 276. 

 Ealph, T. S. — Thymol as a Polariscopic Object. 



[A most splendid polariscopic object. If a very small piece, about the size 

 of a mustard-seed (or perhaps two) is placed at the edge of a cover-glass 

 on a slide (not under), and then made to melt, it will run under it in a 

 very fine film and crystallize on cooling. But before this take place, it 

 should be placed on the stage, with the polarizing apparatus ready, so as 

 to watch tlie process of crystallization. The effects far exceed that of 

 most polariscopic objects. The same specimen carefully remelted can be 

 used over and over again.] 



Jour?i. of Microscopy, III. (1884) pp. 31-2. 



Kataboul, J. — Les Diatomees. Eecolte et preparation. I. Eecolte des Diatomees. 



(The Diatomacese. Collection and preparation. I. Collection of the Dia- 



tomacess.) (In part.) Journ. de Microgr., VII. (1883) pp. 644-6 (1 pi.). 



Eeinold, A. W., and A. W. Euckee. — Liquid Films and Molecular Magnitudes. 



\_Post.'] Proc. Boy. Sac, XXXV. (1883) pp. 149-51. 



Eenson, 0. — Nouveau precede de recherche des Tiichiues dans les Viandes. 



(New method of research for Trichinw in meat.) [Post.'] 



Bull. Soa. Belg'. Micr., X. (1883) pp. 24-25. 



EoTHROCK, J. T.— Some microscopic distinctions between good and bad Timber of 



the same siaecies. Amer. Phil. Soc, Feb. 1883. 



Eothwell's (W. G.) Educational Slides. Micr. News, III. (1883) p. 340. 



EoYSTON-PiGOTT, G. W. — Note on the structure of the Scales of Butterflies. 



Trans. Eastbourne Nat. Hist. Soc, I. (1883) pp. 41-5. 

 EiJCKER, A. W. — See A. W. Eeinold. 



Schaepfee, E. M. — The Microscopical Study of the Crystallization of Allotropic 

 Sulphur. 



[Contains directions for preparing.] 



Amer. Mon. Micr. Journ., V. (1884) pp. 1-3. 

 ScHNETZLEE. — Notiz iiber Tanninreaction bei Siisswasseralgen. (Note on the 

 reaction of tannin in the fresh-water Algse.) [Post.'] 



Bot. Centralbl, XVI. (1883) pp. 157-8. 

 Scott, W. B. — Imbedding in Egg-mass. 



[Euge's improvement of Calberla's method. Cf. Vol. III. (1883), pp. 

 303-4.J 



Science Becord, III. (1883) pp. 41-2. 



