1896 THE MICROSCOPE. 171 



form black spots from a millimeter upward in size. The 

 black spots are the stromas, which in this species are flat, 

 carbonaceous and purplish black. In this species the 

 fung-us g-rows on Crataeg^us. The fruit is in the upper 

 part of the stroma. Cut a small slice, transfer to water in 

 a g^lass slip and mash fine with a spatula and cover. 



Examine with a one fourth or one fifth objective. This 

 will exhibit long- cylindrical asci, with brown spores ar- 

 rang-ed in a uniseriate manner. The spores g^enerally con- 

 tain a round sporo blast at each end. 



Potassic Iodide for Preserving Infusoria. — The use of 

 this medium is very simple and is said b}- Mr. W. S. Kent 

 to act in a manner almost identical with osmic acid. For 

 use, prepare a saturated solution of potassic iodide in dis- 

 tilled water. Saturate the solution with iodide, filter and 

 dilute to a brown sherry color. 



A very small portion, only, of the fluid is to be added to 

 that containing" the infusoria. 



QUESTIONS ANSWERED. 



Note. — Dr. S. G. Shanks, of Albany, N V., kindly consents to receive al.' sorts of gues- 

 iions relating to microscopy, -ivhether asked by professionals or amateiirs. Persons of ai± 

 g ades of experience, front the beginner jiptvard, are 7uelcome to the benefits of this depar'- 

 inent. The questions are numbered for Juture i eference. 



O. 245. — Can you tell me if there is any book published 

 giving- Microscopic examinations for adulteration of food 

 and medicine and where it may be procured and cost? 

 D. A. B. 



A. Hassal, Food, Its Adulterations, etc., $8.75, published 

 by Long-mans, Green & Co., is the classical work; but the 

 g-reat bulk of mote recent work is scattered throug-h the 

 files of the American Analyst, and the various microscopical 

 and other technical journals. 



Q, 246. — Are the fibro vascular bundles and tubes for 

 the circulation of sap? In the sunflower there is only 

 simple cellular tissue. How is circulation accomplished? 

 — Snohomist. 



