306 TWENTY-FOURTH REPORT. 



on the judgment of the Director as to their fitness to make good 

 use of the facilities offered. 



Two classes of investigators are recognized : those who work 

 independently, and those receiving instruction in investigation. 



Investigators' fees are generally paid by the institution to which 

 the investigator belongs, but it is at the discretion of the Director 

 to admit any investigator without charge, and it has never been the 

 policy to refuse admission to any independent investigator solely 

 on the issue of a fee. 



The more experienced investigators, or a selected group thereof, 

 guide the research of beginning investigators. No group in the 

 organization will be of more significance for the future of the 

 Laboratory than beginners in research. 



Admission to the Laboratory is not limited by considerations of 

 nationality. It has become desirable to pursue a positive instead 

 of a merely passive or negative attitude in the matter of inter- 

 national representation. 



The Laboratory is open to investigators throughout the year. 



The Laboratory is open on the same terms to both sexes. 



4. Instruction. In pursuit of the primary purpose of the Labo- 

 ratory it is essential that provision should be made for the produc- 

 tion and training of investigators. It is important that a certain 

 part of such provision should be in the Laboratory itself. Hence 

 instruction of a strictly professional character is also a settled 

 policy of the Laboratory. Experience has shown that instruction 

 may be overemphasized to the detriment of research ; hence the 

 policy of the Laboratory is to limit the courses of instruction of- 

 fered (only five for many years), to require fees adequate to pay 

 all the expenses of instruction, to limit the numbers registered in 

 each course, and to admit no one without satisfactory recom- 

 mendations. 



The intellectual atmosphere of the Laboratory is favorable in 

 the highest possible degree to the development of the research 

 spirit in young students. For their own sake and for the sake of 

 the future development of biology they should not be excluded 

 from the Laboratory. 



In the case of all courses offered, the facilities of the Laboratory, 

 whether of personnel or material, are such as to guarantee that 



