CHEMICAL DEPARTMENT. 505 



mixture. For a complete analysis, not less than two pounds 

 should be sent ; for a partial analysis, three or four ounces 

 will be sufficient. 



Waters. — For the complete analysis of a Water, from two to 

 three gallons are required ; for the determination of the amount 

 of salts in solution, and lime thrown down by boiling, two quart* 

 will suffice. A well water may be selected at any time ; but 

 the water of a spring or running stream should be taken in dry 

 weather. The jars or bottles in which they are sent must be 

 tightly corked and sealed. In the analysis of a mineral water, 

 it may sometimes be desirable to determine the amount of gases 

 held in solution ; in which case certain precautions must bo 

 observed which require the presence of a chemist at the spring. 



Limestones, Clays, Ironstones, <&c. — If the bed of any of these 

 substances of which the analysis is required be very uniform in 

 appearance, a piece of two or three ounces' weight taken from 

 any part of it will be enough for analysis ; but in all cases it is 

 better to send three or four chips from different parts of its 

 thickness. Sometimes where the characters of different parts of 

 the bed vary much, separate analyses of these portions may be 

 requisite, in which case two ounces of each may be sent. 



The following are the rates at which analyses, &c, are fur- 

 nished to Members of the Society, and it is requested that the fee 

 be remitted along with the sample : — 



1. Complete analysis of a Soil, including determination of 



Alkalies and Phosphates, £3. 



2. A partial analysis of a Soil, such as the determination of 



the quantity of Organic Matter, and relative proportion 

 of Clay, Sand, and Carbonate of Lime it contains, 1 0s. 



3. Quantitative determination of any one ingredient of a 



Soil, 7s. 6d. 



4. Complete analysis of Saline Manures and other substances, 



such as Gypsum, Nitrates of Soda and Potash, Am- 

 moniacal Salts, Guano, Oil-cake, Bone-dust, Rape- 

 dust, Superphosphate of Lime, £1. 

 o. Testing the above substances for adulterations — for each 

 sample, 5s. 



This examination is generally sufficient to determine 

 whether or not any of these substances are grossly 

 adulterated, but it gives no idea of the comparative 

 value of different Samples, where all are genuine. 



6. Determination of the percentage of Phosphates and Am- 



monia in a Guano, 10s. 



7. Determining the quantity of Soluble and Insoluble Phos- 



phates in a Superphosphate, 10s. 



This and the preceding determination generally 

 suffice to show whether the sample is of fair 

 2 K 



