ADVERTISEMENTS. 



LEDOUX & CO., 



Analytical and Advising Chemists 



-AND 



Chemical Engineers. 



EXPERT EXAMINATIONS of Phosphate and other 

 Mineral Properties. 



PROFESSIONAL ADVICE regarding the manufacture and manipulation 

 of FERTILIZERS, treatment of rock, and valuation of FERTILIZING 



MATERIALS. 



PLANS and SPECIFICATIONS for the erection of plants for the manufac- 

 ture of fertilizers, acid phosphates, and sulphuric acid. 



ANALYSES of PHOSPHATE ROCK, marls, earths, raw fertilizing materials, 

 mixed fertilizers, sulphuric acid, pyrites, and pyrites cinder. Our long 

 experience in this branch of work justifies us in guaranteeing prompt 

 and accurate returns. 



CONTRACTS by the month or year for professional advice and analytical 

 work. 



PRICES will be furnished on application, and will be made as low as com- 

 patible with accurate work. 



LABORATORIES AND OFFICES: 



NO. 9 CLIFF STREET, NEW YORK. 



