59 THE AMERICAN MONTHLY [Fel)ruaiy, 



ust* of tlic microscope is proving successful in Chica«jo. The 

 College of Pliysicians aiul Surgeons of this city lias lately built large 

 laboratories for its stmiftits. Of these three are inicroscpical. 

 Eacli of the microscopical laboratories is litteil up for about one 

 hun»lrecl stutlents each. The ecpiipnient consists of 31 Leitz Stalio 

 II, obj. ^ aiui J", and nose-piece, and 31 Bausch ami Loml) Conti- 

 nental stand, with j-^and i-<)in. objectives anil nose-piece. Beside 

 these there are a tew old instruments, which make altogether 

 about a hundreil serviceable stands. There are also provided iS 

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

 large instruments for special work of demonstrators. 



The microscopes are in constant use from morning to niglit. 

 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, hartlening, imbed- 

 iling, cutting, staining, mounting, and drawing or descril)ing by 

 cac/i stuiictit. This is done without confusion or diihcultv. 



It has been necessary to resort to the most exacting svstcm 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 — 1-12 oil immersion with condenser. Onlv a few 

 instruments are provided with these accessories. 



The experiment of putting tirst-class instruments in the hands 

 of large numbers of medical students has been successfully tried. 

 Bavaui) II0LMK.S, Director of Laboratories. 



104 East FV>ktibth Sikbet, Chicao<j. 



MI( K()S(OI»l( AL APPAHATUS. 



Making and Using Jars. — A very practicable method for 

 cutting glass l)y which imperfect bottles can be converted into 

 precipitating jars is illustrated in Fig. 2 (A and \\). 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 carefidly 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. W'lien the 

 alcohol is nearlv 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. 



