652 EXPERIMENT STATION RECORD. 



per cent carbonate of soda; (5) a solution of 2 per cent copper sulphate 

 and 3 per cent of bicarbonate of soda; (6) 2 per cent copper sulphate and 

 3 per cent soap ; (7) 2 per cent copper sulphate and 3 per cent carbonate 

 of potash; (8) 2 per cent copper sulphate and 3 per cent carbonate of 

 ammonia; (9) eau celeste, to which sufficient ammonia is added to ren- 

 der the solution slightly alkaline; (10) 2 per cent solution of copper 

 acetate, and (11) neutral acetate of copper. 



The method of distinguishing the adherence of these different fungi- 

 cides was to place small quantities of the liquid on glass plates which 

 had been previously washed with alcohol, and after drying them in the 

 sun subject them to an artificial rain; the liquid remaining on the plate 

 was tested for copper immediately after its deposit, also 2 and 24 hours 

 later. At the expiration of 24 hours the Bordeaux mixtures were the 

 most adherent, followed closely by the mixture composed of copper 

 sulphate and carbonate of potash and eau celeste. Some of the other 

 fungicides had been completely washed off at the end of 24 hours. 



The experiments were repeated, the plates being exposed to natural 

 rain with results analogous to those above. From the authors' experi- 

 ments it seems that acid Bordeaux mixture is less adherent than basic, 

 and basic still less than neutral Bordeaux mixture. The same applies 

 to fungicides containing carbonate of soda. When molasses is added 

 to the mixture in general they are less adherent, and the more molasses 

 added the less the adhesive power. The same applies equally to 

 gelatin. 



In a series of experiments reported later the authors tested the adher- 

 ence of the same fungicides on grape leaves under the same conditions as 

 previously given. In the case of the latter experiments they concluded 

 that in general fungicides as used were less adherent than those pre- 

 pared under the earlier formulas. The difference in the case of the 

 adhesive power of Bordeaux mixture was not very great, but in the case 

 of those fungicides containing soda, soap, or ammonia, it was greatly 

 affected by the method of preparation used. In conclusion the authors 

 state that fungicides to be most adherent to grape foliage, especially 

 those containing soda or soap, ought to be employed immediately after 

 their preparation. 



Based upon their adhesiveness the fungicides maybe arranged in the 

 following order: (1) those containing soap; (2) bicarbonate of soda; (3) 

 carbonate of soda; (4) Bordeaux mixture, carbonate of potash, eau 

 celeste, and acetate of copper; (5) gelatin ; (6) molasses, and (7) neutral 

 acetate of copper. In general all these fungicides are most adherent 

 the nearer neutral they are made. 



The brulure of flax, E. Marchal (Bui. Soc. Belg. Micros., 22 (1S98), pp. 125, 126).— 

 This disease, which results in the etiolation of the plants, is said to be due to Jstero- 

 cystis radicis. 



A clover fungus ( Jour. Bd. Agr. \_London~), 5 (1S9S), No. 1, pp. 37-50, figs 2).— Illus- 

 trated notes are given of Sclerotinia trifoliorum. 



Protection against canker of white fir, Heck (Forstl. Naturw. ZUchr., 7 (189S), 



