1868 Journal of Applied Microscopy 



cells some of the dye is dropped on the section and allowed to remain for thirty 

 seconds. Differentiate in 95 per cent, alcohol until the pink color returns. With 

 this method gonococci may be stained in smears. Dr. Goldhorn concludes 

 from results obtained by the use of the above methods that the prevailing idea 

 that mast cells do not exceed .50 per cent, in health is incorrect, the error being 

 due to inadequate staining methods. His investigations have led him to the 

 conclusion that the average percentage is over .75 per cent. c. w. j. 



Our attention has been called to an error which appeared in the May number 

 of the Journal. About the middle of page 1775 the statement " The tree is 

 monoecious " should read " The tree is dioecious." 



] 



QUESTION BOX. 



Inquiries will be printed in this department from any inquirer. 

 The replies will appear as received. 



24. Will some one give a simple method of preventing curling of paraffin 

 sections during cutting by hand or microtome ? a. h. d. 



25. What is a satisfactory method of mounting simple microscopical objects 

 such as fern or mushroom spores, etc. ? b. b. b. 



26. T. A. B. wishes to learn whether Eastman film cartridges answer the 

 purpose for obtaining small photographs (4 x 5) in tropical regions. Would they 

 be affected by temperature or the degree of moisture ? Would they keep for a 

 year or longer ? If not, what is most desirable for that purpose ? 



Books Received. 



"The Microscope," An introduction to Microscopic Methods and to Histology. 

 By Simon Henry Gage, Professor of Microscopy, Histology and Embryology in 

 Cornell University, and the New York State Veterinary College. Eighth edition, 

 cloth, ^1.50. Published by Comstock Publishing Company, Ithaca, N. Y. 



" How to Improve Bad Negatives." By Edward W. Newcomb, Photo Expert, 

 editor of Photo-American. Cloth, ^1.50. Published by the author, at Bible 

 House, New York City. Postpaid, $1.50. 



" The Cow Pea " is the title of the latest publication issued by the Experiment 

 Farm of the North Carolina State Horticultural Society at Southern Pines, N. 

 C. This book, neatly bound and illustrated in plain and concise manner, dis- 

 cusses the value and uses of this important crop, the Cow Pea. Every reader 

 can get a copy free by writing to the Superintendent of Experiment Farm, 

 Southern Pines, N. C. 



Bulletins University of the State of New York, 12, 13, 14, 15, 16, 17, 46, 49, 

 53, 55, 56, 57. 



Summer Birds of Flathead Lake. Bull. Univ. Mont., 3:1. 



