268 



PREPARATION OF REAGENTS 



. IX 



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

 of a modern biologic laboratory.* 



tLCVATIOh. 

 LOCKL:R5 !h LABORATOR1I15. 



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

 (Jour. Apl. Micr. r$ 9 8, p. 127. ) 



PREPARATION OF REAGENTS 



2 374. General on Preparation of Reagents. In preparing reagents both 

 heights 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. 



