THE AMERICAN 



MONTHLY 



MICROSCOPICAL JOURNAL. 



VOL. XX; ' FEBRUARY, 1899. NO, 2. 



CONTENTS. 



The Leaf of Pinus Virginiaua, McCormick, (Frontispiece) 33-38 



Practical Hints on Mounting, Mason 38-48 



Diatoms and Occidental Sea, Edwards.. 49-53 



Diatoniaceous Earth Containing Cyclotclla, Edwards 53-55 



Washed-Out Red Blood Corpuscles in Urine, Head 56-58 



Letters to the Editor.— Lenal's Apparatus 58-59 



Editorial. — The Journal for 1899, Yeast, New Periodical 59-60 



Microscopical Apparatus. — Bacteriological Laboratory, Mi- 

 cro Photographj' 60-61 



Microscopical Manipulation. — Fixing Blood ifor Microscop- 

 ical Study, Drilling Lenses 61-62 



Medical Microscopy. — InHammation, K'y School of Medicine, 62-65, 

 Bacteriology. — Malaria Microbe. Cheese Rust. Widal' Test ... 65 



New Publications. — Laboratory Manual, Histology 65-66 



Drug and Food Adulteration. — How to Study Drug-s 66-67 



Mij?CELLANEous. — Objects, Printer's Ink, Paste, Aniline, Varnish. 67-68 



Histology of the Leaf of Pinus Virginiana. 



BY FLORENCE A. McCORMICK. 



WITH FRONTISPIECE. 



Pinus Virginiana, scrub pine, is a slender and usually 

 small tree, but sometimes attains a height of 110 feet. 

 It grows in sandy soil, from Long Island to South Caro- 

 lina, west to southern Indiana and Kentucky. The tree 

 can be identified by the straight prickles on its ovate-ob- 

 long cones. There are usually two leaves in a fascicle, 

 rarely; however, three are found. The transverse section 

 of a leaf from a fascicle containing three leaves is al- 

 most semi-circular in outline, but that from a fascicle con- 

 taining three leaves is almost triangular, with the dorsal 

 side curved outward. 



The leaves are from four to nine centimeters in length, 

 fig. A. For study, leaves were gathered in October at 

 Knoxville. Portions from the middle of the leaf were 



