The MiCKOScopE. 45 



Anilin green stains the celloidin a very beautiful green, but if 

 properly used, produces an exquisitely beautiful object and does not 

 interfere with a good view of the tissue and other elements. 



In preparing caterpillars, chrysalids, worms, and objects having 

 a hard or imi)enetrable exterior, it is necessary to make o})enings so 

 that the celloidin solution may reach the interior and thence pene- 

 trate all parts. 



In most cases I tind celloidin preferable to paraffin, especially 

 where the use of heat is injurious, or not convenient, or where it is 

 important to retain every part in exact place. Sections prepared with 

 celloidin may be transferred at once and fixed upon slide with cel- 

 loidin and clove oil as a fixing agent, using the usual preliminary 

 precautions, and may then be stained, cleared, etc., as where paraffin 

 is used. One ounce of the celloidin will suffice for a great number 

 of objects. 



WILLIAM A. ROGEES, A. M., Ph. D., 



President of the American Society of Microscopists. 



TTT'ILLIAM A. ROGERS, the subject of this brief sketch, 

 ' ' was born in a small village near New London, Conn., 

 in the year 183!2. His early education was acquired in De 

 Ruyter, N. Y., at the De Ruyter Academy. In 1853 he 

 entered an advanced class in the Alfred, N. Y., Academy, from 

 which institution he was graduated in 1854. He then entered 

 the sophomore class of Brown University, pursuing the regular 

 classical course of study until 1857, when he was graduated with the 

 degree of A. M.* The same year he accepted a position as tutor in 

 the Alfred Acadeiny, where, during the year following, he was 

 elected professor of mathematics and astronomy, which chair he 

 occupied for the next thirteen years. Daring this period he was 

 granted special leave of absence, for the purpose of better qualifying 

 himself in advanced study of the particular branches he had been 

 called upon to teach. One year was passed as a student of theoret- 

 ical and applied mechanics in the Sheffield Scientific School of Yale 

 College; one year as a special student of astronomy in the Harvard 

 University Observatory, followed by six months' experience as assist- 

 ant. He was also fourteen months in the U. S. Naval service during 

 the civil war. 



While at Alfi'ed, Professor Rogers built an astronomical observ- 



*The class of '57 was the last where the students received the degree of Artium Mag- 

 ister on graduation. Since that date the Brown University has conferred the usual degree 

 of Artium Bacccdaureus, in conformity with the general custom of other American colleges. 



