much profit to the people. Mosquito fish are bred and distrib- 

 uted for the extermination of insect pests. Besides food fishes 

 there are many sea products that are sources of revenue. These 

 include oysters, clams, shrimps, crabs, pearl and button shells, 

 window shells, trepang, sponges, etc. Each of these products 

 can be improved and increased through Government help and 

 regulation. In most countries the fishery survey precedes the 

 development of this industry, and here we can scarcely expect 

 more development along these lines until this work has been 

 done. On the other hand, there is a very active interest from a 

 number of sources in the establishment of sardine canneries and 

 in other Philippine fisheries resources, and I have every reason 

 to anticipate a rapid growth of this industry if the Government 

 can afford to do the pioneer work. Besides the actual exploita- 

 tion on the marine products, these will afford the raw materials 

 for several household industries. 



The study of the food of birds has established the fact that 

 birds are very important in protecting forests and agricultural 

 products and that they hold in check some of the most injurious 

 insects. The Philippine Legislature has wisely passed laws 

 based upon the information of the Bureau of Science, protecting 

 Philippine birds and mammals. Careful and extended study of 

 the food of birds is needed to learn which kinds are of especial 

 benefit to man and which are useless or injurious. 



CHEMISTRY 



In our inorganic laboratories tests of nearly 10,000 samples 

 of cement have been made annually as well as physical tests of 

 reenforcing iron, steel, rope, wire, ties, road material, cement 

 pipes, concrete, mortar, building blocks, bricks, tiles, stones, 

 cloth, and other similar materials. Analyses are made of clays, 

 rocks, minerals, soils, fertilizers, iron and steel, paints, pig- 

 ments, metals and alloys, articles such as spoons, mixed paints, 

 electric batteries, water-proofing compounds, crude chemicals, 

 etc., for the various branches of the Government, provinces, 

 municipalities, and the United States Army, for private parties, 

 and for general purposes. Many analyses are performed to 

 assist in the valuation of customs' imports, to decide the cause of 

 damage to imported goods, and to settle controversies between 

 importers, shipping houses, and insurance firms. Considerable 

 work has been done to find substitutes for chemicals and other 

 substances unavailable in the Philippines because of the war and 

 to devise methods suitable for their use. The assaying of ores is 

 also carried on. Investigations in the field of corrosion of, and 



