124 THE AMEKICAN MONTHLY [June, 



By Mr. Lewis Mooers, with Seibert, (polariscope) : Ethyl gallate. 



By Dr. S J. Radclifte, with Beck: Seed vessel of poppy. 



By Dr. Robert Reyburn, with Beck and Qiieen : Eggs of water 

 snail, Lymnia stagiialis^ and boquet of flowers. 



By Dr. H. A. Robbins, with Reichert : Tongue of rabbit. 



By Dr. C. W. Richardson, with Zentmayer's Histological: Tran- 

 section of bone showing Haversian canals. 



By Dr. Wm. H. Seaman, with B. & L. : Pond life. 



By Mr. A. N. Skinner, with Zentmayer's Histological : Circulation 

 of blood in frog's foot. 



By Mr. C. W. Smiley, with Crouch's Histological, (polariscope) : 

 Potassium chlorate. 



By Dr. C. H. Stowell, with Beck's Ideal : Section of human scalp. 



By Dr. J. F. Scott, (exhibit not catalogued). 



By J. M. Stedman, B. S., with B. & L's. Investigator, and Harvard, 

 (polariscope) : Section of granite, and embryo of chick, thirty-six 

 hours incubation. 



By Dr. Thomas Taylor, with large Zeiss, and Bulloch : Pure and 

 compound lard. 



By Mr. J. M. Yznaga, with B. & L. : Honey bee (various parts). 



This exhibit of objects was a credit to the Society, and served its pur- 

 pose in that it aflbrded the visitors a very interesting and instructive 

 evening's enjoyment, tending, as it did, to interest the public to a just 

 appreciation of the science of miscroscopy. 



Simple Method of examining living Infusoria. — Herr J. Eis- 

 mond has discovered a method of showing those rapid movements of 

 infusoria which make the examination of these objects during life so 

 diflicult. The method is based on that of crystallographers, who retard 

 the formation of cr3'stals by the addition of a colloidal material. He 

 added a drop of thick watery solution of cherry-gum, and obtained the 

 desired effect. In a very short time the ciliata were seen to be impris- 

 oned, with all their cilia moving actively, but effecting no change in 

 position. All the vital processes can be most satisfactorily observed in 

 infusoria so treated, and a certain amount of locomotion can be allowed 

 by using a less dense solution. Small Crustacea, worms, and flagel- 

 lata, and other marine animals, may be well studied by this method. 

 It may be added that gum-arabic and other fixing materials are useless. 

 — Zoolos'ischer Anzeip'er. 



To Preserve the Edges of Microtome Knives. — To render in- 

 struments perfectly aseptic, and to preserve the cutting edges from 

 oxidation, they should be boiled for five minutes in a one per cent, solu- 

 tion of carbonate of sodium. They can remain in this solution indefi- 

 nitely without rusting or dulling the cutting edge. When required for 

 operation they are taken out, dried with a sterilized piece of gauze, 

 and handed to the operator. Whenever, in course of operation, they 

 come in contact with anything not asceptic, all that is required to re- 

 sterilize them is to dip them for a fevv^ seconds into the boiling solution 

 of sodium bicarbonate. — Dental Review. 



