364 ARACHNOIDEA, 



CASE Vienna, in which large old plants of Vitis vinifera, L., V. vinifera, 

 ^^^^' var. Vesuviana, from Vesuvius ; var. Alexandrina, from North 

 Africa ; var. Lacrima Christi, from Naples ; var. Carinthiaca, 

 from Armenia and Taurus ; and vars. Arizonica, Eng. aestivalis, 

 Mich, and cordifolia, Mich., from North America, were trained 

 in espaher on a wall. Of these the Vitis cordifolia, V. vinifera, 

 var. Alexandrina, and var. Lacrima Christi, were not touched by- 

 gall mites, whilst the leaves of all the rest were every year 

 covered with Phyllerium spots. 



On the ash. 



The so-called clusters of the ash. They are the monstrous 

 deformed styles of the flower, which gather into a ball, brownish 

 green at the beginning, later on a dark brown, causing rough 

 masses on the upper part, which have on the outside a great 

 similarity to fragments of the upper part of a cauliflower. Its 

 upper side is clothed, as it were, with colourless hair cloth, from 

 which come stick-like hairs. They are solid, without any hollow 

 space, and, in a drv state so hard, that they can be sawn and cut 

 like wood. 



It was until now unknown from whence these Cecidiums derived 

 their origin. The circumstance that they were always found on 

 the same trees and boughs left very litde doubt of the gall mites 

 being the author of them, but still certainty was wanted. Herr 

 Low's researches have now shown that gall mites cause these 

 clusters, and live in great numbers in them. They are almost as 

 clear as glass, and the smallest animals of this family, inasmuch 

 they cannot be seen even with a strong glass. But if a gall is 

 washed in water and examined with the microscope the living 

 mites will be found in the sediment in considerable numbers. 



On the Mulberry. 

 Trichoxyreus, Sp., Am. 

 Dr. Amerling discovered upon the mulberry a new kind of mite. 



