52 tse ameHIcaK Monthly [Fei)ruary, 



use of the microscope is proving successful in Chicago. The 

 College of Ph\'sicians and Surgeons of this city has lately built large 

 laboratories for its stiidents. Of these three are microscpical. 

 Each of the microscopical laboratories is fitted up for about one 

 hundred students each. The equipment consists of 31 Leitz Stalio 

 11, obj. 3 and 7, and nose-piece, and 31 Bausch and Lomb Conti- 

 nental stand, with 3-3 and 1-6 in. objectives and nose-piece. Beside 

 these there are a few old instruments, w^hich make altogether 

 about a hundred serviceable stands. There are also provided 18 

 Bausch and Lomb microtomes for the use of students, beside the 

 large instruments for special work of demonstrators. 



The microscopes are in constant use from morning to nigiit. 

 As soon as one class turns them in, another class takes them out. 

 With such large numbers as good work is done as has ever been 

 accomplished with small classes before. 



The histology, for example, includes fixing, hardening, imbed- 

 ding, cutting, staining, mounting, and drawing or describing by 

 each sttide7it. This is done without confusion or difficulty. 



It has been necessary to resort to the most exacting system of 

 accounting for the instruments. Only one has, so far, been in- 

 jured or broken. 



Our teachers of embryology, pathology, and bacteriology use 

 higher powers — i-i3 oil immersion with condenser. Only a few 

 instruments are provided with these accessories. 



The experiment of putting first-class instruments in the hands 

 of large numbers of medical students has been successfully tried. 

 Bayard Holmes, Director of Laboratories. 



104 EASr FOKTIETH STREET, CHICAGO. 



MICROSCOPICAL APPARATUS. 



Making and Using Jars. — A very practicable method for 

 cutting glass by which imperfect bottles can be converted into 

 precipitating jars is illustrated in Fig. 2 (A and B). Take an 

 ordinary bottle and tie around its body just below the shoulder a 

 double strand of candle-wicking ; then thoroughly saturate the 

 ring of wick with alcohol by carefully pouring upon it a thin 

 stream from the lip of a small graduate. Ignite the alcohol and 

 hold the bottle in position shown in the figure, so that the glass 

 above the string will be heated more than that below. When the 

 alcohol is nearly burned out, carefully let fall upon the wick only 

 a few drops of cold water. This method, if executed with ordi- 

 nary care and promptness, will usually sever the neck and shoul- 

 ders from the body of the bottle by causing a clean crack imme- 

 diately underneath the string, and a precipitating jar will thus be 

 obtained. 



