26 THE BUREAU OF SCIENCE 



different commercial pure and mixed paints to determine their 

 actual value under local conditions is being carried on. 



Field ivater survey. — A paper on water supplies in the Phil- 

 ippine Islands, by Alvin J. Cox, George W. Heise, and V. Q. Gana, 

 has been completed and published. Field water survey work has 

 been begun within the last three months and so far has been 

 carried into Cebu and Iloilo Provinces. Its chief objects are to 

 give immediate information to officials in charge of public works 

 and sanitation and construction and to establish chemical stand- 

 ards for judging Philippine waters. It is possible to get the 

 greatest accuracy only in the laboratory, but the rapidity and 

 many other important factors more than compensate for the 

 disadvantages of working in the field. Already this work has 

 saved to the inhabitants of these Islands many times the cost of 

 the undertaking. 



Galvanized iron and tin plate. — Work was undertaken to show 

 the chief causes of the diminished durability in a tropical climate 

 of galvanized iron available on the market at present as compared 

 with that of two or three decades ago. In connection with this 

 work the excessive rusting of tin containers, which has entailed 

 severe loss upon several local manufacturers, was studied. The 

 problems involved were those of corrosion and protective coatings 

 in general. Tin coating sufficient to give satisfactory results 

 under normal condition of service is too thin and too poorly 

 applied to prevent excessive corrosion under the slightly severe 

 conditions of a tropical climate. 



Iron smelting. — A study has been made of the modifications 

 of Filipino smelting processes, which can be put into effect by 

 small producers for an improvement in yield and quantity of 

 iron and economy of production. 



Lime buvfiing. — Operations have been carried on to secure a 

 small kiln that will be economical of fuel and serviceable to the 

 small producer. 



Cement. — Attempts have been made to produce a cheap pozzo- 

 lana cement from volcanic tuff and lime which can be substituted 

 for Portland cement in certain classes of construction. Papers 

 on Burning tests of Philippine Portland cement raw materials, 

 by Augustus P. West and Alvin J. Cox ; The efficiency of Portland 

 cement raw materials from Naga, Cebu, by W. C. Reibling and 

 F. D. Reyes ; and Natural cement versus brick ; Iwahig Penal 

 Colony raw materials, by W. C. Reibling, have been published. 



Soils. — A paper on The soils of the Island of Luzon, by Alvin 

 J. Cox and A. S. Argiielles, has been finished and published, and 



