LABORATORY SUPPLIES AND CHEMICALS 



2f,3 



3720 



3721 



3720 RESPIRATORS to prevent lead poisoning and salivation. This respirator is 



invaluable to those engaged in dry crushing quartz mills, quicksilver 

 mines, white lead corroding, and all occupations where the surround- 

 ing atmosphere is filled with dust, or poisonous vapors. Each $3.00 



RETORT ADAPTERS, see Adapters. 



3721 REDUCTOR, Blair's, for the determination of phosphorous in steel by re- 



duction of the solution by filtration through zinc; complete as illus- 

 trated 6.00 



REDUCTOR, the tube, with stopcock only. 

 See Blair's Analysis, 7th edition, page 94. 



2.50 



3722 



3724 



3726 



3722 RETORTS, Glass, plain. 



Capacity, ounces ............................. 2 



Each ......................................... $1.00 



3724 RETORTS, Glass, with glass stopper. 



Capacity, ounces ........................ 2 4 



Each .......... . ......................... $1.00 1.25 



3726 RETORTS, Glass, stoppered, with ground-in receiver. 



Capacity, ounces .................................. 



Each 



4 

 1.25 



8 

 1.75 



8 

 1.50 



2 

 $0.50 



4 

 .75 



16 

 1.75 



12 16 

 2.00 2.25 



8 

 1.00 



32 

 2.25 



32 

 2.50 



16 

 1.50 



3727 



3727 RETORTS, porcelain, vitrified, with tubulature stopper. 



Size No 1 2 3 



Capacity, cc 140 210 275 



Each $2.50 4.00 4.35 



