158 



watering should also be performed before harvest in infested centres 

 which are to be destroyed. The introduction of rooted plants into 

 clean districts should be prohibited ; when intended for planting 

 in a zone of limited infection, rooted plants should be disinfected before 

 being removed from the nursery. The method of disinfection used in 

 Italy, namely, total immersion in water heated to 131'^ F. for five or ten 

 minutes, is not absolutely innocuous. Immersion of the underground 

 part in a 3 per cent, solution of potassium sulpho-carbonate and a i_ 

 1 per cent, solution of soft soap for 12 hours gives the desired result. 



In conclusion, it is pointed out that in Italy, although excellent : 

 seed-vines have been selected (Longo) and equally good hybrids have 

 been obtained (e.g., some sorts of Kuggeri), up to the present time 

 stocks of French origin have been used almost entirely in the 

 reconstitution of vineyards. 



A short bibliography is appended. 



Savastano (L.). La manipolazione della poltiglia solfo-calcica. 

 (Formols della Stazione di Agrumicoltura.) 3» edizione. [The 

 preparation of lime-sulphur mixture. (Formula of the Station 

 for Citrus Culture.) 3rd edition.] — Boll. R. Staz. Speriment. 

 Agrum. Fruttic, Acireale, no. 15, October 1914, 14 pp., 1 fig. 

 [Received 2nd March 1916.] 



This third edition is essentially the same as the original one [see this 

 Review, Ser. A, ii, p. 412], but contains additional details and advice 

 suggested by three years' working. A figure and description are given 

 of the Savastano densimeter specially designed for use with the lime- 

 sulphur mixture. Two parallel scales are provided, one for densities from 

 1"13 to r37 and the other for percentages from 8 to 2 per cent. The 

 density of 1'25 is taken as a standard, the percentage figure against it 

 being 5. If a normal strength spray is required, a stock of 1.25 density 

 should be diluted to a 5 per cent, solution. If the density is the greater 

 one of 1*29 (mark 4 on the percentage scale) the stock should be diluted 

 to a 4 per cent, solution in order to yield a spray of equal strength. 

 The latter will also be produced by a 6 per cent, solution of stock of the 

 lesser density 1*21 (mark 6 on the percentage scale). When a spray 

 of a strength other than the normal 5 per cent, is required, the density 

 of 1*25 is still retained as a standard, and if the stock has that density 

 it only needs diluting to the new percentage — in other words, the 

 figure 5 is replaced by the new percentage figure. With stock of 

 greater or less densities the procedure described above is followed, but 

 the percentage figures on the scale must be modified in the same degree 

 as the new percentage figure differs from the figure 5. If, for instance, 

 a spraying strength of 8 per cent. (3 more than 5) is required and the 

 stock has a density of 1'29, then it must be diluted to 7 per cent. 

 (3 more than 4). 



PoMA (D.). L'olivicoltura nel circondario di Trapani. [Olive culture 

 in the Trapani district.] — Annali R. Staz. Sperimenl. Aqrurn. 

 Fruttic. Acireale, iii. 1915, pp. 111-134. [Received 2nd March 

 1916.] 



This account of the cultivation of the olive in the district of 

 Trapani (Sicily) aims at giving full data with a view to encouraging its 



