G2 The Mickoscot^E. 



the magnifying lens, and under it a cone of paper with the small 

 upper end cut off. This cone stands over a large opening in a 

 box from which the front has been removed. When in use the 

 apparatus is placed near the lamp flame in such a manner that 

 the mirror reflects the light through the object, the lens and the 

 hollow cone, into the box and upon a sheet of paper placed 

 on the table beneath the central opening. The image thus 

 thrown down can be easily copied by the artist line for line. 

 The apparatus is so simple that anyone can make it out of wood 

 and paste-board, if he can command a concave mirror and n 

 good lens. 



PVBLICATIONS 



Chemical lecture notes. By H. M, Whelpley, M, D. Third 

 edition. Illustrated. 12mo., pp. 211. St. Louis, Mo. Price 

 $1.50. — This little book, while it is primarily intended as a help 

 to the college student in refreshing his memory of the lecture 

 course, should be a useful one for any reader to have within 

 reach at any moment, as it contains much that is often needed 

 by every educated and observing person. The best trained 

 memory is treacherous and needs a hint to be able to recall its 

 information, a word sometimes being sufiicient. This small 

 book should be helpful to those who. like the school boy, know 

 but can't think. Its statements are in an exceedingly concise 

 form, a single word often answering the purpose of a sentence 

 to the lecturer or to the college student, and capable of doing the 

 same to those who have been through a similar course of lectures 

 or of reading. While it is devoted to chemistry chiefly it does 

 not neglect what is called physics, or what at one time was styled 

 natural philosophy. The microscopist will find some interesting 

 and suggestive matter in the twenty-two pages devoted to the 

 study of light. The medical reader who wishes to polish up his 

 chemical knowledge will find the book a convenient means of 

 accomplishing that object. 



