2J THE ALUMNI JOURNAL 



up more of the solution and to discard the excess, as follows: 



100 grains of the solution would contain 5 grains of salt (this 

 is the meaning of "5%"), so 



To make up 100 grains of solution, we would use 95 grains 

 of water and add to it 5 grains of KI, giving us 100 grains of 

 solution. 



To make up the rl 5II wanted, use the weight of two fluid 

 ounces of water and add to it the required amount of salt. The 

 resulting solution will measure as much more as the added salt 

 will displace in volume, which is a small amount. 



Make the following proportion: 



Solvent : Salt : : Solvent : Salt 



95 : 5 - 4557X2 : x 



(455.7X2) 5 

 x= =47.88 grains 



95 



Answer: We must use 47.88 grains of Potassium Iodine and 

 911.40 grains of water. 



Example: Solution of Sodium Chloride, 10% O I 

 How much Sodium Chloride and how much water must be used? 



Start with the weight of one pint of water, 7291 grains. 



810. 1 1 grains 

 90 



Answer: We must use 810.11 grains of Sodium Chloride and 

 7291 grains of water. 



PRIZE OFFER. 



Through the generosity of Mr. Theodore Weioker, of the firm 

 1 if E. R. Squibb & Sons, the Editor is in a position to offer two 

 cash-prizes for the best essays on the following subject: 



How can the Alumi Association best promote the interests of 

 the College of Pharmacy : 



The following conditions are to be observed: 



t. The writer must be a. graduate or student of the N. Y. C. P. 



2. The essay must comprise about 1,000 words. 



3. The essay must be submitted to the Editor on or before the 

 20th of April, 1 91 2. 



4. The value of the essays submitted will be determined by a 

 committee of three: $15.00. respectively. $to.oo, will be paid for 

 tlii' two essays judged to be the best. 



5. The Editor reserves the right to publish or reject any or 

 all essays submitted. 



