464 



SCIENCE 



[N. S. Vol. XXXIX. No. 1004 



A SIMPLE APPARATUS FOR WASHING SMALL AND 

 DELICATE OBJECTS FOE SECTIONXNG 



The apparatus here described was devised 

 for washing small and delicate objects fixed in 

 Flemming-fluid. It has been found successful 

 and economical for washing with distilled 

 water also. 



The apparatus consists of a round-hottomed 

 glass tube, six inches long and one inch in 

 diameter, a double-bored, tightly fitting stop- 



iti 



per,^ through which the inlet tube A and the 

 U-shaped outlet tube B pass. 



The inlet tube A should be inserted at a 

 slight angle so that its lower end lies in the 

 center of the round-bottomed tube within half 

 an inch of the bottom. This end is covered 

 with a piece of fine bolting-silk fastened with 

 a rubber band. The bolting-silk breaks the 

 force of the inflowing water, but more espe- 

 cially prevents the entrance of any foreign sub- 

 stance which might close the outlet. The 

 upper end of tube A is connected by a rubber 

 tube to the distilled water reservoir or faucet. 

 The flow of water is regulated by screw com- 

 pressor 0. 



The outlet tube B has its inner arm a trifle 

 longer than the outer arm, so that the TJ does 



1 The stopper and small tubes must fit tightly 

 to maintain an air chamber between the stopper 

 and the lower end of tube B. 



not act as a syphon. The inner arm of this 

 tube is covered with bolting-silk also, to pre- 

 vent the escape of any material which may 

 float.= 



With the water merely dripping, a liter per 

 hour, the material is kept in constant motion 

 and thoroughly washed. 



S. I. KORNHAUSER 



THE CORRESPONDENCE OF LINNAEUS 



To THE Editor of Science : Dr. J. M. Hulth, 

 of the University Library of Upsala, who has 

 succeeded to the editorship of Carl von Linne's 

 correspondence, formerly edited by the late 

 Professor Th. M. Fries, desires information 

 as to the whereabouts of letters to and from 

 Linne which might be found in collections in 

 this country. Individuals or institutions hav- 

 ing such letters are asked to communicate 

 with the undersigned. 



Aksel G. S. Josephson 



The John Creear Library, 

 Chicago, III. 



EXHIBITION of THE ROYAL PHOTOGRAPHIC SOCIETY 



To the Editor of Science: The Eoyal 

 Photographic Society of Great Britain are 

 holding their fifty-ninth annual exhibition in 

 August and September of this year. This is 

 the most representative exhibition of photo- 

 graphic work in the world, and the society is 

 anxious to make it more international in 

 character. It is very desirable that American 

 scientific photography should be fully repre- 

 sented at the exhibition, and in order to en- 

 able this to be done with less work to the 

 exhibitor, I have arranged to collect and for- 

 ward American work intended for the scien- 

 tific section. 



This work should consist of prints showing 

 the use of photography for scientific purposes 

 and its application to spectroscopy, astronomy, 

 radiography, biology, etc. Photographs should 

 reach me not later than Friday, July 10. 

 They should be mounted but not framed. 



2 If the objects to be washed tend to float, a 

 disk of perforated celluloid through which the 

 inlet tube passes may be placed about an inch 

 from the bottom of the larger tube. 



