184 MICROSCOPIC FUNGI. 



of water on a glass slide. A thin glass cover is 

 placed over tlie drop of water^ and the slide is 

 submitted to examination. For further satisfaction 

 it will often be found necessary to make carefully 

 a tliin section of a pustule^ and place this under the 

 microscope^ a more troublesome but also much 

 more satisfactory method. Reference to the Ap- 

 pendix will soon determine the name and position 

 of the fungus^ provided it belongs to the section to 

 which this volume is devoted. 



If it is thought desirable to mount the spores as 

 permanent objects^ there is no obstacle to such a 

 proceeding. The spores of the different species of 

 Aregmay of Trvpliragmiimn, and many of the Fuc- 

 cinice^ will be worth the trouble. We have tried 

 several media^ and only adopted Glycerine or 

 Balsam ; either of these^ especially the former^ if 

 the greater difficulty of securely closing can be 

 overcome^ will answer the purpose. 



It should be remarked that in the examination 

 of moulds^ such as those of the genus Peroiiospora, 

 included in this work^ if any fluid be added, the 

 acrospores are immediately disconnected from the 

 threads^ and float in the medium ; so that if their 

 mode of attachment or arrangement would be 

 studied^ that must be achieved without the addition 

 of any fluid whatever. 



The best methods of observing germination^ the 

 production of zoospores^ &c.^ have been detailed 

 already. 



