xin, D. 5 Haughwout: Protozoa of Manila and Vicinity: I 189 



a millimeter rule to a predetermined scale. By using a mag- 

 nification of 500 diameters, each millimeter of the rule corres- 

 ponds to 2 ju, (0.002 millimeter). 



In lieu of this, the organisms may be measured directly under 

 the microscope by employing a stage micrometer and micrometer 

 ocular; or they may be projected on to paper and drawn with 

 the aid of a camera lucida. 



This series of papers is designed to form the basis of a census 

 of the Protozoa of the Philippine Islands and will, of course, 

 deal with parasitic as well as free-living species. It is a task 

 that at best will consume many years and certainly cannot be 

 completed within the span of one man's life. I must, to a large 

 extent, fall back upon the assistance of others, such as my col- 

 leagues, students, and other volunteer workers. Already I am 

 indebted to several friends for reporting species that had not 

 come under my notice. It is planned to acknowledge all such 

 reports in this series. Such surveys have been made in many 

 other places, generally under State support, and their value 

 scarcely needs to be touched upon. The intimate relations of 

 the Protozoa to problems in general biology, medicine, veterinary 

 medicine, geology, physiology, pharmacology, and other sciences, 

 as well as their importance as ultimate sources of food supply, 

 has been so often pointed out that it is superfluous to make 

 mention of them here. 



There are at present no facilities in Manila for making studies 

 of the marine forms found in neighboring waters, save some of 

 the more easily obtainable plankton forms; therefore a study 

 of the local Foraminifera ^^ and Radiolaria will probably have to 

 be indefinitely deferred. 



The system of classification that will be followed is that set 

 forth by Calkins." It has occurred to me to introduce some 

 changes in classification and nomenclature made desirable 

 through recent progress in the science, such as the abolition of 

 the genus Leishmania and the incorporation of the organisms 

 included within it in the older genus Herpetomonas, where it 

 seems to belong; or the removal of the genus Plasmodium from 

 the Hsemosporidia to the Coccidiida. Several changes are sug- 

 gested in the Infusoria, particularly among the Hypotrichida, 



"Cushman \_Proc. U. S. Nat. Mus. (1911), 38, No. 1759] has made a 

 study of a few species of arenaceous Foraminifera found in Philippine 

 waters, in connection with the work of the Albatross Expedition of 1907- 

 1910. 



'"Calkins, G. N., Protozoology. Lea & Febiger, Philadelphia (1909). 



