and Laboratory Methods. 



2019 



The apparatus is worked by pouring in 

 ether through the funnel, and then (having 

 closed T) opening P. In about half a 

 minute the specimen which lies on the 

 surface K is frozen, and will keep so for 

 about 15 minutes. The apparatus works 

 well, the consumption of ether is small, and 



though intended for the Schanze can be 



Fig. 1. / A , ^ , . ^, 



'• ^ adapted to any microtome. The measure- 

 ments of the freezing box are : lower surface, 4-2.5 cm.; upper surface, 2.5-2 



cm.; height, 3 cm. 



Wesenberg, G. Dropper for Sterile Fluids. 

 Centralbl. Bakt. 30 : 703-704, i fig., 1901. 

 (From Journ. Royal Micros. Society, Feb. 

 p. 116, 1902,) 



A. M. C. 



G. Wesenberg describes a dropping ap- 

 paratus (Fig. 2) which is of simple con- 

 struction and of especial advantage in 

 disinfection experiments for washing the 

 disinfectant out of the object to be tested. It consists of 

 a caoutchouc plug, which is inserted into a test-tube or the 

 neck of a flask. The plug has two perforations, one for a 

 bent tube a through which air enters, and the other for the 

 bent tube d. The latter is narrowed at c so that it can be 

 broken off or sealed up in the flame. The way of using 

 the apparatus is obvious. If the fluid does not flow freely 

 it may be forced on by blowing through a. 



There is little chance of air-infection if the end of d 

 be held close to a flame when the tube is set upright after 

 using it. A. M. c. 



Fig. 2. 



CURRENT ZOOLOGICAL LITERATURE. 



CHARLES A. KOFOID, University of California. 



Books and Separates of Papers on Zoological Subjects should be Sent for Review to Charles A. 

 Kofoid, University of California, Berkeley, California. 



Bradford, J. R., and Plimmer, H. Q. The -pj^g authors have studied this parasite 

 Trypanosoma Brucu, the Organism found in 



Nagana, or the Tse-tse Fly Disease. Quart. in the blood and the various organs of 



Journ. Micr.Sci. 45: 449-473. pis. 24-25, 1902. ^^^ j.^^^ mouse, rabbit, guinea pig, dog, 



and cat. The flagellated adult stage should be studied under a cover-glass sup- 

 ported by a thin paraffin ring to obviate pressure, and sealed with paraffin to stop 

 evaporation. The rapid movements of the organism may be checked by mixing a 

 drop of 1 per cent, gelatin solution or a weak solution of cherry gum with the 

 blood. The structure of the living organism, including the nucleus, micronu- 

 cleus, vacuole, and alveolar protoplasm, is demonstrated by the use of dark ground 

 illumination or monochromatic light. The former may be obtained even with a 

 2 mm. immersion objective, after the method of Gebhardt. Spectral monochro- 



