1316 Journal of Applied Microscopy 



The Cold Spring Harbor Biological Laboratory. — -The twelfth session 

 of the biological laboratory of the Brooklyn Institute of Arts and Sciences will 

 be held at Cold Spring Harbor, L. I., from Wednesday, July 3d, until August 

 13th. The following courses are offered : Professor C. B. Davenport, University 

 of Chicago, high school zoology ; variation and inheritance. Professor H. S. 

 Pratt, Haverford College, comparative anatomy. Dr. L. E. Griffin, Western 

 Reserve University, invertebrate embryology. Dr. A. G. Mayer, Brooklyn 

 Institute Museum, entomology. Professor E. B. Copeland, West Virginia Uni- 

 versity, cryptogamic and physiologic botany. Mr. H. H. Whitford, University 

 of Chicago, plant ecology. Professor N. F. Davis, Bucknell University, bacteri- 

 ology. Mrs. C. B. Davenport, microscopic methods. Dr. H. A. Kelly, Ethical 

 Culture Schools, nature study. Professor S. R. Williams, Miami University, 

 will give instructions in animal bionomics; Professor W. L. Tower, Antioch 

 College, assists in entomology, and Mr. A. F. Blakeslee, Harvard University, in 

 botany. Louise B. Dunn, Barnard College, assists in ecology. A new labora- 

 tory, exclusively for investigators, is announced. The dining and rooming 

 accommodations are under the immediate control of the laboratory. There is a 

 uniform fee of twenty- five dollars for study at the laboratory; private rooms are 

 fifty dollars for the entire season. Board and room costs six dollars per week. 

 Correspondence should be addressed to the director, Professor C. B. Davenport, 

 University of Chicago, Chicago, 111. 



QUESTION BOX. 



Inquiries will be printed in this department from any inquirer. 

 The replies will appear as received. 



What is meant by the '' growing t\^'' in Allium — when used for mitosis as 

 'figured in Wilson's book on the Cell ? — v. a. l. 



Can synthol be used in place of carbolic acid ? — v. a. l. 



What are the three formulae of Kaiserling's solution, so often quoted ? — v. a. l. 



Can a Welsbach light be used in photo-micrography with ^ H. I. objective 

 and an achromatic ocular, and give light enough to focus on ground glass screen ? 



V. A. L, 



Can H. I. lenses yL, 1^2- to > ^^c., be used in photo-micrography with a Welsbach 

 gas light only, using Abbe condenser and bulls-eye with an ocular in place ? The 

 light on the focusing screen is so dim as to render the object indiscernible. Is 

 an aplanatic ocular prone to give more light for this purpose ? — c. l. p. 



