268 



PREPARATION OF REAGENTS 



[CH. IX 



constructed the tray is very reasonable in price and most useful for the needs 

 of a modern biologic laboratory.* 



ooo 

 :x30 

 ooo 

 ©oo, 



3 INCH HOLE5. . 



OOOO 



oooo 



OOOO 



oooo 



§000 

 gooo 



1, 2 8r 2i INCH HOLES. 



SUDES rOR« , ' ' NCH H0LE5 ' 



REAGENT BOARDS PLANS 



AMD DRAWERS. or 



REAGENT BOARD5 



REAGENT BOARDS AMD DRAWERS ARE 

 INTERCHANGEABLE THROUGHOUT. 



ELCVATIOM. V 



L0CKCR5 IM LABORATORIES. 



Fig. 214. Student Locker with trays and reagent boards. 

 {Jour. Apt. Mia: 1898, p. 127. ) 



PREPARATION OF REAGENTS 



I 374. General on Preparation of Reagents. — In preparing reagents both 

 weights and measures are used. As a rule the amounts given are those which 

 experience has -shown to give good results. Variations in the proportions of 

 the mixtures are sometimes advantageous, and in almost every case a slight 

 change in the proportions makes no difference. Most laboratory reagents are 



*In Ithaca, these trays are made and furnished by the H. J. Bool Furni- 

 ture Co. The cost per 100 of the original form is $17.50 (§ 371); for the form 

 with tongue and groove, it is $22.50 ; and for the form with tongue and groove 

 and one side divided into rows (# 373), the cost is $30 per hundred. 



