924 SUMMARY OF CURRENT RESEARCHES RELATING TO 



The filtering materials were greensand, silver sand, powdered 

 glass, brickdust, coke, animal charcoal, and spongy iron. These 

 materials were all used in the same state of division, being made to 

 pass through a sieve of 40 meshes to the inch. Columns 6 in. in 

 height were used. 



It was found that only greensand, coke, animal charcoal, and 

 spongy iron wholly removed the micro-organisms from water filtering 

 through them, and this power was in every case lost after the filters 

 had been in operation for one month. With the exception of the 

 animal charcoal, however, all these substances, even after being in 

 action for one month, continued to remove a very considerable pro- 

 portion of the organisms present in the unfiltered water, and in this 

 respect coke and spongy iron occupy the first place. 



The results obtained by agitating water with various solid materials 

 show that a very great reduction in the number of suspended organisms 

 may be accomplished by this mode of treatment, and the complete 

 removal of all organisms by agitation with coke is especially worthy 

 of notice. 



Again, the results obtained with Clark's process show that we 

 possess in this simple and useful mode of treating water a means of 

 greatly reducing the number of suspended organisms. 



Thus, although the production in large quantities of sterilized 

 potable water is a matter of great difficulty, involving the continual 

 renewal of filtering materials, there are numerous and simple methods 

 of treatment which secure a large reduction in the number of 

 organisms present in water. 



Any, J. E. — The Microscopic Study of Bocks. VII., VIII. Petrographical 



Demonstrations. 



Illus. Sci. Monthly, III. (1885) pp. 227-9 (1 fig.), 259-62 (1 fig.). 

 Bacillus tuberculosis, modified method of staining. 



[The method which, according to the ' Deutsche Militar - Aertzliche 

 Zeitung,' is taught the medical officers of the army. Also Baumgarten's 

 method.] 



The Microscope, V. (1885) pp. 189-90. 

 from Western Medical Review. 

 Beckwith, E. F. — Some observations on the Distribution and Termination of 

 Nerves in the Human Lungs. 

 [Methods. Supra, p. 894.] 



The Microscope, V. (1885) pp. 148-52 (3 figs.). 

 Bizzozero, G. — Manuel de Microscopic clinique, Microscopie legale, Chimie 

 clinique, Technique, Bacterioscopie. (Manual of clinical microscopy, legal 

 microscopy, clinical chemistry, technique, bacteriology.) 



2ad French edition, translated by C. Firket. 

 xviii. and 568 pp., 7 pis. and 103 figs., 8vo, Bruxelles, 1885. 

 Chapman's Mould for Microscopical Cells. [Supra, p. 911.] 



Journ. N. York Micr. Soc, I. (1885) p. 188. 

 Cole' s (A. 0.) Studies in Microscopical Science. (Parts VII. and VIII., pp. 25-8, 

 29-32.) 



Sect. I. The Structure of Antheridia in Polytrichum. Plate VII. Antheridia 



and Sporogouium of a Moss. — Non-sexual organs of reproduction in 



Vascular Cryptogams. Plate VIII. V. S. of Sorus of Soolopendrium. x 75. 



Sect. II. Kespiratory Organs. Plate VII. Gill of Anodon. V. T. Sec. with 



