DISEASE OP THE VINE. 231 



maintain their ground to shelter one another, for they will be a 

 thick wood, and an orchard of this nature can be got up in half 

 the time that one of standard trees could be reared. 



This principle is capable of further extension by means of 

 hollow wooden cylinders of oue-inch boards on end, and of 

 circular single brick walls; but, as this paper is already sufficiently 

 long, I will conclude here, as I have had no practical experience 

 of culture in the hollow cylinder, whereas the other is in good 

 working order. 



XX. — On the Disease of the Vine. Read before the Royal 

 Academy of Georgofili of Florence, on the 5th September, 

 1852, by Prof. Giovanni Battista Amici, Hon. Member. 



(Translated from the Italian.) 



In order to preserve an accurate record of the disease which has 

 caused, and still continues to cause, such injury to our vines, Sig. 

 Autiuori, director of the Imperial and Royal Museum, ordered 

 models in wax to be prepared, illustrating the diseased state as 

 well of the grapes themselves as of the shoots. I was instructed 

 to assist at the operation, and to add, with appropriately magnified 

 dimensions, such particulars as should be furnished by my micro- 

 scopical observations. The plastic operation, confided to young 

 Sig. Tortori, under the distinguished Lusini, head of the manufac- 

 ture, has been executed by him in wax with such ability as to give 

 to the models a perfect resemblance to the originals, and although 

 the whole of the intended preparations are not as yet completed, 

 yet such as are now finished have appeared to me of sufficient 

 interest to lay them before the Academy, who, I trust, in a 

 subject of such serious importance, will allow me to accompany 

 this presentation by some considerations suggested to me by the 

 recent perusal of a memoir by Sig. Berenger, inserted in the new 

 Giprnale d" Agricultura entitled II Coltivatore, on the 5th of 

 August of this year. In this memoir is the following remarkable 

 sentence, " The celebrated Oidium Tuckeri of the Italian vines is 

 a chimera, and the cryptogamous plant described under that 

 name is no other than the Erysiphe communis in its sterile, 

 flocciferous state." The author laments that such men as De 

 Notaris, Balsamo, Crivelli, Pietro Savi, and others should have 



