298 THE AMERICAN MONTHLY [Oct 



Dismids, and other AAg-ae, both fresh-water and marine, 

 Characeas, Fungi, Lichens, Hepaticae, Musci, Filicinae, 

 Equisitinae, Lycopodinae, Gymnospermae, and most of the 

 more important orders of Angiospermae. The material 

 will be supplied either fresh or preserved ; and in the lat- 

 ter form it is intended to keep in stock large quantities of 

 materia], so that students will be independent of the season 

 for their supplies. Special attention will be devoted to mi- 

 croscopy, and high-class and guaranteed preparations il- 

 lustrating- the more important structural features of the 

 principal types will be generally available. 



Mounting.— Objects, other than crystillizations, for po- 

 arized light are generally mounted in Canada Balsam. The 

 mounting- of hairs is quite si mple, though it is advisable to 

 give them a preparatory soaking in turpentine or benzole 

 beforehand . They make striking objects when crossed or 

 interwoven. Mr? Cole recommendsthefollowing procedure 

 in mounting fish-scales :— "Scrape the fish from the head 

 towards the tail ; if scraped the other way, nearly all the 

 scales will be injured. Place the scrapings in a bottle of 

 water, shake well, pour off the water, and repeat the pro- 

 cess until quite clean. Examine with! a microscope ; and if 

 you find that the scales are not clean, pour off the water, 

 add liquor potassae,and soak for an hour or two. Then wash 

 away the potash with repeated changes of water,dehydrate 

 in the methylated spirit, clear in clove oil, and mount in 

 Canada Balsam. Sometimes fish-scales buckle up inspiritl 

 and they will not lie fiat. When this happens, put them into 

 water again, and soak a little while ; then place them on a 

 slide, and put another slide over them, press down until 

 quite flat, and tie the two glasses together with twine, and 

 place them in a vessel of methylated spirit to dehydrate 

 under pressure. This method will answer for all tissues 

 that twist during process of dehydration." 



The Method of Healing With or Without Drugs. 



Send 2 dimes or 20 one cent stamps for a copy. If sick and poor, say so on postal 

 eard, receive afree copy. You will cure yourself and others ■without expense if you 

 will obey our teachings. CHA8. W. 8MILET, Washington, D. C. 



