1899J MICROSCOPICAL JOURNAL. 151 



known, but probably the later editions have been brought 

 up to date. For the UredineaB and Ustilaginege the student 

 may consult "Dr. Plowright's Monograph," and for most 

 of the other groups — except the last two, on which I 

 know no modern work in English — Mr. Massee's "British 

 Fungus Flora." With reference to plants injurious to 

 trees and crops, we have Dr. W. Gr. Smith's "Diseases of 

 Field and Grarden Crops," and especially the English edi- 

 tion of Tubeuf's "Diseases of Plants induced by Crypto- 

 gamic Parasites." 



In conclusion, I wish to say that the groups have not 

 been dealt with in any sort of systematic order. They 

 have been taken rather in a kind of biological sequence, 

 according to the nature of the substances on which they 

 live. I have used the word spore throughout as indicat- 

 ing the reproductive body, no matter how it has been 

 formed — whether naked, in asci and so forth. Within 

 the limits of such an article as this it has been impossi- 

 ble to touch more than the extreme fringe of the sub- 

 ject, which to treat in detail would occupy not one but 

 several large volumes. My leading idea has been to 

 stimulate persons desirous of doing some microscopic 

 work, and in doubt as to what branch to choose, to select 

 this most fascinating study, and to leave them, not sati- 

 ated, but rather like Oliver Twist, "asking for more" 

 information. — III. Ann. Mic. 



On The Exhibition of Live Animals at Soirees. 



MARCUS HARTOG. 



The exhibition of Polyzoa, Hydrozoa, Rotifers, Crus- 

 tacea, etc., has always been a matter of difficulty, and the 

 following details of a method which avoids the constant 

 need of watching to prevent evaporation, etc., may be 

 found of interest. The animals are mounted in a hang- 

 ing drop of water on the under side of the cover-glass, 



