244 REPORT OF INVESTIGATIONS AND PROJECTS. 



eggs of certain insects. Although not securing the student assistance antici- 

 pated, he was able to make considerable progress with the work, and has, 

 with the aid of a technician to make preparations, secured much valuable 

 material covering early stages of development. A part of this material has 

 been sectioned and mounted — several thousand sections in all. A preliminary 

 study of the sections has been made, and sketches of several stages have 

 been drawn. 



Unfortunately, in the early winter the insect eggs, which were being kept 

 in cold storage and brought forward as occasion required, all died, so that it 

 was impossible to keep up the parasitism during the year, as had been ex- 

 pected. This is the first time that such a catastrophe has overtaken the eggs 

 kept in cold storage, and it is hoped that it can be prevented in future. 



The work will be continued during the coming winter, and it is hoped that 

 a paper on the results may be submitted during the current year. 



As the balance of the aid still unexpended is larger than anticipated, no 

 additional grant will be asked for the coming year. 



Crampton, Henry E., Columbia University, New York, New York. Grant 

 No. 563. Study of variation, mutation, heredity, and geographical dis- 

 tribution of Polynesian species of Partula. (For previous reports see 

 Year Books Nos. 6 and 7.) $2,500. 



Although my work is scarcely half over, it is progressing satisfactorily 

 and conditions seem to be favorable for the investigations in the Tonga and 

 Samoa groups, even at this time of the year. The survey of certain portions 

 of the Society group has given some unexpected and extremely gratifying 

 results. The same is true of the short but adequate study of the Cook Islands. 

 If the studies at Samoa give definite results at once, I will immediately pre- 

 pare and forward a statement at the earliest possible moment. 



Howard, L. O., U. S. Department of Agriculture, Washington, District of 



Columbia. Grant No. 250. Preparation of a monograph on American 



mosquitoes. (For previous reports see Year Books Nos. 2, 3, 4, 5, 6, 



and 7.) $3,000. 



Although no grant was made to the mosquito monograph during the last 



year, it may be well to make a brief statement to the following efifect : 



The past year has been devoted to a completion of the manuscript and to 

 the preparation of illustrations. Some additional material has been received. 

 The manuscript for the systematic portion of the monograph is now com- 

 pleted. It covers 2,700 typewritten pages and will occupy three volumes. A 

 fourth volume, considering the subject of remedies, carriage of disease, and 

 a general consideration of all matters relating to mosquitoes, is practically 

 completed and the finishing touches are now being given to it. A very large 

 series of illustrations is ready, but there are still a number to be made. These, 



